Want to understand the causes and treatments in more detail? Explore our complete guide below ↓
1. Why Does Hair Fall Happen?
Hair fall is common, but persistent shedding or gradually thinning hair can indicate an underlying issue that needs attention. Before choosing a hair growth product or booking an in-clinic procedure, it is important to understand the difference between normal hair shedding and different forms of hair loss.
Understanding the Normal Hair Growth Cycle
Hair grows in a repeating cycle that includes a growth phase, a transition phase and a resting phase. At the end of this cycle, the hair sheds and new hair may grow from the same follicle.
Losing approximately 50–100 hairs per day is commonly described as normal. Finding a few strands on your pillow, comb or bathroom floor does not necessarily mean you have a hair loss condition.
Problems arise when the shedding becomes excessive, hair follicles progressively produce thinner strands, or new hair does not adequately replace hair that has been lost.
Hair Shedding, Hair Thinning and Hair Breakage Are Different
Excessive hair shedding usually means more hairs than usual are entering the shedding phase. It can be associated with stress, illness, childbirth or significant weight changes.
Hair thinning refers to a reduction in hair density. You may notice a widening parting, reduced coverage at the crown or a progressively thinner ponytail.
Hair breakage occurs when the hair shaft breaks before reaching its normal length. Heat styling, chemical treatments, friction, tight hairstyles and hair-shaft damage can contribute to breakage.
These concerns can occur together, but they do not necessarily have the same cause or require the same treatment.
The American Academy of Dermatology’s guide to hair loss explains how to distinguish excessive shedding from other forms of hair loss. Understanding this distinction is the first step towards choosing an appropriate treatment.
2. Why Can Hair Fall Start 2–3 Months After a Trigger?
One of the most confusing aspects of hair fall is the delay between a stressful event and the beginning of excessive shedding.
You may have recovered from an illness, returned to your regular routine after a demanding period, or completed a phase of rapid weight loss, only to notice increased hair shedding several weeks later.
What Is Telogen Effluvium?
Telogen effluvium is a form of excessive hair shedding that occurs when a greater proportion of hair follicles shifts into the resting phase of the hair growth cycle.
Normally, a relatively small proportion of scalp hairs are in this resting phase at any one time. Following a physical or emotional stressor, more follicles may enter the phase together. The affected hairs then shed after a delay, often around two to three months after the trigger.
The British Association of Dermatologists’ patient guide to telogen effluvium explains this delayed shedding pattern and its common triggers.
Common Triggers of Delayed Hair Shedding
Telogen effluvium may follow:
- A significant illness, high fever or surgery.
- Major emotional stress or prolonged psychological strain.
- Childbirth and postpartum hormonal changes.
- Rapid weight loss, crash dieting or inadequate nutritional intake.
- Certain medication changes.
- Some hormonal or systemic health conditions.
Sometimes, more than one trigger is involved. In other cases, a clear cause cannot be identified.
Does Every Type of Hair Loss Start After a Trigger?
No. The two-to-three-month pattern is particularly relevant to telogen effluvium, not every form of hair loss.
Hereditary or pattern hair loss often develops gradually over months or years. Alopecia areata which is an autoimmune condition may cause sudden, well-defined bald patches, while certain inflammatory or scarring conditions can damage follicles and lead to permanent hair loss if treatment is delayed.
If shedding continues, your hair density is decreasing, or you notice an unusual pattern of hair loss, a clinical assessment can help distinguish between these possibilities.
3. What Are the Common Causes of Hair Fall?
Hair loss is often multifactorial. A person may have hereditary thinning alongside iron deficiency, or temporary shedding that makes an underlying pattern of hair loss more noticeable.
Iron Deficiency and Low Iron Stores
Iron is necessary for several bodily functions, including the production of haemoglobin, which carries oxygen in the blood. Iron deficiency, with or without anaemia, may be associated with diffuse hair shedding.
Women with heavy menstrual bleeding, restricted diets, pregnancy-related nutritional demands or certain gastrointestinal conditions may have a higher likelihood of iron deficiency.
However, not every person with hair fall has low iron, and a low ferritin result must be interpreted alongside the person’s symptoms and other findings. Iron supplementation should not be started simply because hair is falling.
Nutritional Deficiencies
Inadequate protein and certain nutrient deficiencies can contribute to hair loss. Low intake, restrictive diets, significant weight loss and conditions affecting nutrient absorption may increase the risk.
Vitamin D and vitamin B12 deficiencies may be relevant in selected patients. However, an association between a low nutrient level and hair loss does not automatically establish that the deficiency is the sole cause.
Taking extra supplements when your levels are already adequate is not a guaranteed way to improve hair growth.
Thyroid Disorders
Both underactive and overactive thyroid conditions can affect the hair growth cycle. Hair thinning or excessive shedding may occur alongside other symptoms such as fatigue, weight changes, temperature sensitivity, menstrual changes or changes in bowel habits.
A thyroid blood test may be appropriate when the medical history or examination suggests a thyroid-related contribution.
Hormonal Changes and PCOS
Hormonal changes around pregnancy, childbirth and menopause can influence hair growth.
Women with polycystic ovary syndrome (PCOS) may experience scalp thinning alongside irregular periods, acne, oily skin or increased facial and body hair. These features do not prove that PCOS is responsible, but they may indicate that a more focused hormonal assessment is needed.
Hormone testing should be selected according to the symptoms and clinical findings rather than automatically ordering a complete hormone panel for everyone experiencing hair fall.
Genetic Hair Loss
Female and male pattern hair loss is commonly associated with genetic susceptibility and the gradual miniaturisation of hair follicles.
Women may notice a widening parting or thinning over the crown, while men often develop a receding hairline or thinning around the crown. The pattern differs between individuals, and both men and women can experience hereditary hair loss.
Because this condition may progress, early identification is important when treatment is appropriate.
Scalp Conditions and Inflammation
Conditions such as seborrhoeic dermatitis, psoriasis and scalp infections can affect the scalp and sometimes contribute to shedding or breakage.
Persistent redness, scaling, itching, tenderness, pain or oozing should not be dismissed as ordinary dandruff. Certain inflammatory and scarring forms of hair loss require prompt medical assessment to protect remaining follicles.
Medication-Related Hair Loss
Some medicines can contribute to hair shedding, depending on the drug and the individual. Hair loss may occur after starting a medication, changing a dose or stopping certain hormonal treatments.
If you suspect a prescribed medicine is contributing to your hair fall, discuss it with your prescribing doctor. Do not stop or change a prescribed medicine on your own.
4. Which Blood Tests Should You Consider for Hair Fall?
Blood tests can be useful when they investigate a plausible cause of hair loss. However, there is no single blood-test panel that is appropriate for every person.
The choice of investigations should follow your symptoms, medical history, dietary patterns, scalp examination and any additional signs of an underlying condition.
CBC and Haemoglobin
A complete blood count (CBC) measures components of the blood, including red blood cells and haemoglobin.
It can help identify anaemia and provide clues about certain underlying conditions. If iron deficiency is suspected, the CBC is often considered alongside iron studies rather than being used alone to assess iron stores.
A normal haemoglobin level does not necessarily mean that iron stores are adequate.
Serum Ferritin and Iron Studies
Ferritin is a protein that reflects the body’s stored iron. A ferritin test can help identify depleted iron stores, sometimes before anaemia develops.
Other iron studies, such as serum iron, transferrin saturation and total iron-binding capacity, may provide additional information depending on the clinical situation.
Serum iron alone can fluctuate and is not a complete substitute for assessing iron stores. Ferritin can also rise during inflammation, so the result may need to be interpreted in context.
There is no single ferritin target that guarantees hair regrowth in every patient. Treatment decisions should be based on the overall clinical picture, laboratory findings and the cause of any deficiency.
Vitamin D and Vitamin B12
Vitamin D and B12 tests may be useful when there are relevant risk factors, symptoms, dietary restrictions or concerns about absorption.
For example, a doctor may consider B12 testing in someone following a vegan diet without adequate supplementation or in a person with a condition that affects nutrient absorption. Vitamin D assessment may be appropriate when other clinical factors indicate a risk of deficiency.
These tests are not automatically required for everyone with hair loss. If a deficiency is confirmed, the cause and appropriate replacement plan should be addressed.
TSH and Thyroid Function Tests
Thyroid-stimulating hormone (TSH) is commonly used as the initial screening test for thyroid dysfunction in many clinical settings.
If TSH is abnormal, Free T4 may help clarify the nature and extent of thyroid dysfunction. Free T4 may also be requested in selected situations based on symptoms and clinical judgement.
Thyroid antibody tests, such as thyroid peroxidase antibodies (Anti TPO Abs) or Anti TG Abs, are generally considered when there is a reason to investigate an autoimmune thyroid condition. They are not a routine requirement for every patient with hair fall.
When Are Other Blood Tests Appropriate?
Additional investigations depend on the pattern of hair loss and other clinical findings.
For example, targeted hormone testing may be considered when scalp thinning occurs alongside irregular periods, increased facial hair, persistent acne or other signs of androgen excess. Zinc or other nutrient testing may be appropriate when dietary history, malabsorption or examination findings suggest a deficiency.
A broad list of tests can add unnecessary expense if it does not address a clinically relevant question.
The aim is to identify the investigations most likely to inform your care, not to order every available test.
The Indian expert consensus on the management of telogen effluvium discusses basic and advanced investigations, including the importance of reserving additional testing for cases where the history or examination suggests a particular cause.
5. How Do Doctors Diagnose the Cause of Hair Fall?
An accurate diagnosis usually involves more than a blood test. Bloodwork can identify certain contributing factors, but it cannot diagnose every form of hair loss.
Medical History
Your doctor may ask when the hair fall started, whether it began suddenly or gradually, how it has changed, and whether there is a family history of thinning.
Other relevant questions may cover recent illness, fever, childbirth, stress, weight changes, dietary patterns, menstrual history, medications, supplements and previous hair treatments.
The timing of these events can help distinguish delayed shedding from other patterns of hair loss.
Scalp and Hair Examination
A clinical examination can assess hair density, the pattern of thinning, the condition of the scalp and whether there are areas of breakage or inflammation.
Your doctor may also examine your eyebrows, nails or other areas of hair growth when relevant. These findings can provide clues about particular medical conditions.
A hair-pull test or other examination techniques may be useful in selected cases. A scalp biopsy is sometimes considered when the diagnosis remains unclear or a scarring condition is suspected.
Blood tests are then selected according to the clinical assessment. Not everybody needs the same investigations.
Why Diagnosis Comes Before Treatment
Two people can have similar amounts of hair shedding but very different underlying causes. One person may have temporary shedding after an illness, while another may have progressive hereditary thinning or a combination of conditions.
The most appropriate treatment therefore depends on identifying the problem being treated, rather than selecting the procedure that is most popular.
6. What Are the Best Treatments for Hair Fall?
There is no single treatment that works for every cause of hair loss. Some forms improve when the underlying trigger is addressed, while others may require ongoing medical treatment to maintain progress.
Diagnosis-Specific Medical Treatment
When hair loss is linked to iron deficiency, thyroid dysfunction or another underlying condition, managing that condition may be an important part of treatment.
For hereditary pattern hair loss, topical minoxidil is an established option for suitable patients. It generally takes several months to evaluate the response, and continued use is often needed to maintain benefits. It is not appropriate for every type of hair loss, and a doctor can explain its suitability, application and possible side effects.
Other prescription treatments may be considered according to the diagnosis, sex, age, medical history and reproductive considerations. Some medicines require particular caution during pregnancy or when pregnancy is possible.
For alopecia areata, scalp infections and inflammatory conditions, different medicines or specialist treatments may be required. Treating these conditions as though they were ordinary hair shedding can delay appropriate care.
PRP Hair Treatment
Platelet-rich plasma (PRP) is an in-clinic procedure that involves collecting a small blood sample, processing it to concentrate platelets, and injecting the prepared material into selected areas of the scalp.
PRP is being studied and used for certain forms of pattern hair loss. Some clinical trials and systematic reviews suggest that it may improve hair density in selected patients, but the evidence varies in quality, and treatment methods are not fully standardised.
PRP should be viewed as a possible component of a treatment plan rather than a guaranteed solution. It does not correct every nutritional deficiency, hormonal condition or scalp disorder, and it may not be appropriate for all types or stages of hair loss.
At Skin Series, PRP hair treatment in Thane may be considered after an assessment determines whether the procedure is appropriate for your hair and scalp concerns.
For a research overview, see this systematic review of PRP for androgenetic alopecia, which discusses the potential benefits as well as limitations in the available evidence.
GFC Hair Treatment
Growth Factor Concentrate (GFC) is a regenerative procedure that uses a preparation derived from the patient’s own blood. The preparation is designed to concentrate growth factors for injection into selected areas of the scalp.
GFC is related to the broader family of platelet-derived and growth-factor-based procedures, but preparation methods and terminology can vary. The amount of high-quality evidence supporting these procedures is still developing, and direct comparisons between different preparations remain limited.
It is therefore not accurate to say that GFC is universally better than PRP, or that it guarantees faster or more substantial hair growth.
At Skin Series, GFC hair treatment in Thane may be considered for suitable patients as part of a personalised treatment plan. The choice between GFC, PRP or another approach should depend on the diagnosis, treatment goals, suitability and the evidence available.
A 2025 review of concentrated growth factor applications for androgenetic alopecia describes encouraging findings but also highlights limitations such as small studies and inconsistent assessment methods. These limitations are important when setting expectations.
Other In-Clinic Options
Depending on the cause and stage of hair loss, a doctor may discuss other appropriate procedures or combinations of therapies. Some people may be candidates for hair transplantation, while others may benefit more from medical management or treatment of an underlying scalp condition.
In-clinic procedures should not replace diagnosis-specific medical treatment when the latter is indicated. Your doctor should explain the purpose of each recommended option, the expected benefits, potential side effects, cost and whether ongoing treatment may be required.
7. What Can You Do at Home to Manage Hair Fall?
Home care can support scalp health and reduce avoidable hair damage, but it cannot replace appropriate treatment for every hair loss condition.
Follow Gentle Scalp and Hair Care
Use a shampoo suited to your scalp and wash as often as needed to keep it clean. Avoid vigorous scratching, excessive friction and repeated use of styling methods that pull on the hair.
Limit excessive heat and harsh chemical treatments if you notice breakage. Tight hairstyles worn repeatedly can contribute to traction alopecia, so choose styles that do not cause persistent pulling or discomfort.
Eat a Balanced Diet With Adequate Protein
Hair growth requires adequate nutrients. Include suitable protein sources and a varied diet containing iron-rich foods, vegetables, fruit and other nutrient-dense foods.
Very restrictive diets, rapid weight loss and prolonged inadequate calorie intake can contribute to hair shedding. If you are struggling with dietary restrictions or suspected deficiencies, a qualified healthcare professional or dietitian can help you make appropriate changes.
Use Hair Products for Their Intended Purpose
Shampoos, conditioners and styling products may improve cleanliness, manageability and the appearance of hair. However, a product that makes hair feel thicker or smoother does not necessarily treat the underlying cause of hair loss.
Be cautious about products that promise guaranteed regrowth or claim to work for every type of hair loss.
Use Supplements Only When Appropriate
Iron, vitamin D, B12, zinc and other nutrients may be needed when a deficiency is identified. But taking extra supplements without a demonstrated need does not guarantee improved hair growth.
Excess intake of certain nutrients, including vitamin A and selenium, can itself contribute to hair loss. High-dose biotin can also interfere with some laboratory tests, including certain thyroid tests.
Tell your doctor about all the supplements you take, and follow their guidance on whether any should be paused before testing.
8. How Long Does It Take to See Results?
Hair restoration takes time because hair follicles operate on a biological growth cycle. Even when the underlying cause is addressed, changes in shedding and visible density do not necessarily happen at the same time.
Reduction in Shedding Versus Visible Regrowth
With telogen effluvium, shedding may gradually settle after the trigger has resolved. However, the time required varies, and regrowth may take additional months to become noticeable.
For hereditary pattern hair loss, improvement from ongoing treatment is generally assessed over several months. Some treatments require continued use to maintain their effects.
PRP and GFC also require realistic expectations. The timing and degree of improvement vary according to the underlying condition, baseline hair density, treatment protocol and individual response.
What Affects the Results?
Several factors can influence progress:
- The type and duration of hair loss.
- Whether an underlying trigger can be identified and addressed.
- The degree of follicle miniaturisation or damage.
- Consistency with an appropriate treatment plan.
- Other medical conditions, medications and nutritional factors.
Not every case of hair loss is fully reversible. Some conditions can be managed effectively, while progressive or scarring forms may require long-term treatment to preserve remaining hair.
Why Progress Monitoring Matters
Your doctor may review your scalp, shedding pattern and hair density at planned intervals. Standardised photographs can help document changes more reliably than memory alone.
Follow-up also allows your practitioner to assess whether the plan is working as expected, identify possible side effects and decide whether adjustments are needed.
9. When Should You Consult a Hair Loss Specialist?
Seek professional assessment if you notice persistent or progressive changes in your hair, especially when the cause is unclear.
Signs That Need Assessment
Arrange a consultation if you experience:
- Ongoing or unusually heavy shedding.
- A widening parting or steadily decreasing hair density.
- Sudden or patchy hair loss.
- Hair loss accompanied by scalp redness, pain, scaling or persistent itching.
- Broken hairs or smooth areas of hair loss.
- Hair thinning alongside irregular periods, new facial hair growth or other possible hormonal symptoms.
Sudden, patchy or painful hair loss deserves timely assessment because some conditions need prompt treatment to protect the follicles.
If hair loss appears after starting a medication, tell your prescribing doctor rather than stopping the medicine yourself.
Why Early Assessment Can Help
Hair loss can have overlapping causes, and some conditions are more manageable when recognised early. A clinical assessment can help determine whether the priority is correcting a deficiency, treating a scalp condition, managing hereditary thinning or considering an in-clinic procedure.
It can also prevent unnecessary spending on tests, supplements or procedures that do not address your actual concern.
10. How Does Skin Series Approach Hair Restoration?
At Skin Series, the Hair Restore Program is built around the principle that successful hair restoration starts with understanding why hair loss is happening.
Located in Thane West, Mumbai, Skin Series follows a doctor-led, structured approach to hair and scalp concerns, with treatment recommendations based on individual assessment rather than a fixed procedure for everyone.
A Personalised Hair and Scalp Assessment
The program begins with a detailed history and clinical examination. Your doctor may review the pattern and duration of hair loss, family history, stress, dietary habits, medication use, scalp health and relevant hormonal changes.
Investigations are selected when indicated by the clinical assessment. Depending on the findings, treatment may focus on an underlying medical concern, a suitable home-care protocol or an in-clinic option.
Treatment Selected According to the Diagnosis
PRP, GFC, mesotherapy and other treatments may be considered when appropriate, but they are not automatically recommended to every patient. The chosen approach depends on the type of hair loss, its severity, clinical suitability, patient preferences and expected benefits.
This assessment-led philosophy helps distinguish between cases where a procedure might be useful and those where another form of treatment should take priority.
Review, Adjust and Maintain
Hair restoration often requires consistent follow-up. Progress reviews allow the clinical team to evaluate changes and make adjustments according to how the scalp and hair respond.
Some conditions, particularly hereditary pattern hair loss, may require maintenance treatment to help preserve improvement. Other forms of shedding may settle after the underlying trigger is addressed.
The purpose of a structured program is to make the journey clearer: what is being treated, why it was selected and how progress will be reviewed.
Explore the Hair Restore Program at Skin Series to learn more about its assessment-led approach and book a Hair & Scalp Consultation in Thane West.
Hair restoration should begin with the right questions, not an automatic recommendation for a procedure.
Frequently Asked Questions About Hair Fall
Can I have low ferritin even if my haemoglobin is normal?
Yes. Ferritin reflects stored iron, while haemoglobin measures the oxygen-carrying protein in red blood cells. Iron stores can be depleted before haemoglobin falls enough to indicate anaemia. A doctor may recommend ferritin and other iron studies when iron deficiency is suspected, then determine whether treatment is needed based on the results and clinical context.
Can vitamin D or B12 deficiency contribute to hair fall?
Nutrient deficiencies may contribute to hair concerns in some people, and vitamin D or B12 testing may be appropriate when symptoms or risk factors suggest a deficiency. However, not every person with hair fall has low vitamin levels, and taking supplements without a demonstrated need is not guaranteed to improve hair growth.
Is TSH enough to check thyroid-related hair loss?
TSH is commonly used as the initial thyroid screening test. Depending on the result, symptoms and medical history, a doctor may recommend Free T4 or additional investigations. Thyroid antibody tests may be considered when autoimmune thyroid disease is suspected. The appropriate testing strategy depends on the clinical situation.
Can stress cause hair fall months later?
Yes. Physical or emotional stress can contribute to telogen effluvium, in which increased shedding often becomes noticeable around two to three months after a trigger. Similar shedding can follow illness, surgery, childbirth or significant weight loss. However, stress is not the explanation for every type of hair loss, so persistent or unusual symptoms should be assessed.
Is PRP or GFC better for hair fall?
Neither treatment is universally better. PRP has been evaluated in clinical trials and systematic reviews, with some evidence of improved hair density in selected patients with pattern hair loss, although study quality and protocols vary. GFC is an emerging related approach with developing evidence and limited direct comparisons. A doctor should determine whether either procedure is appropriate for your diagnosis.
Can hair fall be reversed?
Some forms of hair shedding, such as telogen effluvium after a temporary trigger, can improve when the trigger resolves. Hair loss caused by a correctable deficiency or certain medical conditions may also improve with appropriate treatment. Hereditary pattern hair loss often requires ongoing management, while some scarring conditions can cause permanent loss. The possibility of regrowth depends on the cause and whether the follicles remain capable of producing hair.
Which blood tests should I get before a hair fall consultation?
Common blood tests for hair fall may include CBC, Ferritin/Iron Studies, TSH, Vitamin D, and Vitamin B12. Free T4, thyroid antibodies, or hormone tests may be recommended if needed. Your doctor will determine which tests are appropriate based on your symptoms and medical history.
