Hair fall is one of the most searched concerns in India & also misunderstood. Here is a evidence-based guide to what actually causes hair fall & what helps.
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Hair fall affects most people at some point, but the causes are far more varied than most hair fall treatments acknowledge. This guide covers the most common causes of hair fall including nutritional deficiency, stress, hormonal changes, and scalp health, and the treatments and lifestyle changes that actually make a difference.
Hair fall is one of those concerns that generates enormous anxiety and enormous amounts of bad advice in equal measure. The internet is full of remedies from onion juice, to rice water, to unnecessary biotin supplements, and lets not start on expensive shampoos. One thing to note is they give little clarity about which ones are actually backed by evidence and which are simply popular.
The starting point for addressing hair fall effectively is understanding what is causing it. Hair fall is a symptom, not a condition in itself. It has many different causes that require different approaches. Using the right treatment for the wrong cause produces no result at all.
This guide covers the most common causes of hair fall in Indian women, the nutritional and lifestyle factors that genuinely affect hair health, and the approaches that have evidence behind them.
Before diving into causes, it helps to understand how hair grows because most hair fall concerns become clearer once you understand the cycle it is part of.
Every hair follicle goes through three phases.
The anagen phase is active growth, lasting two to seven years.
The catagen phase is a brief transitional period of two to three weeks where growth stops.
The telogen phase is a resting phase of two to four months, after which the hair sheds and the follicle begins a new anagen phase.
Losing 50 to 100 hairs a day is completely normal, these are telogen-phase hairs completing their cycle. What signals a problem is when significantly more hairs are falling, when regrowth is visibly thinner, or when the shedding is concentrated in specific areas rather than evenly distributed.
Hair follicles are among the most metabolically active cells in the body and they require a consistent supply of nutrients to maintain growth. Deficiency in any key nutrient that can trigger or worsen hair fall.
Iron deficiency is one of the most common causes of hair fall in Indian women and one of the most frequently missed. Iron deficiency anaemia affects a significant proportion of women in India, and hair fall is often one of the first visible symptoms. A simple blood test measuring ferritin (stored iron) levels which is not just haemoglobin, is the most reliable way to check.
Vitamin D deficiency is extremely prevalent in India despite high the sun exposure. Mostly because the UV rays required for vitamin D synthesis are strongest in the hours most people avoid being outdoors. Vitamin D plays a role in hair follicle cycling, and deficiency has been associated with increased hair fall.
Zinc supports DNA replication in rapidly dividing hair follicle cells. Deficiency causes hair thinning and increased shedding.
Biotin (vitamin B7) is widely marketed for hair growth, but true biotin deficiency is rare in people who eat a varied diet. Supplementing biotin when levels are normal does not produce the dramatic results suggested by most hair supplement marketing. 1
Hormones significantly influence the hair growth cycle.
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Hormones significantly influence the hair growth cycle. Oestrogen is associated with prolonged anagen (growth) phase, which is why many women experience their best hair during pregnancy when oestrogen is high, and significant shedding in the postpartum period when oestrogen drops sharply.
Thyroid dysfunction that is both hypothyroidism and hyperthyroidism, affects the hair growth cycle. It can cause diffuse hair thinning across the scalp. Thyroid-related hair fall typically improves once the thyroid condition is treated.
Polycystic ovary syndrome (PCOS) is one of the most common hormonal conditions affecting Indian women and often presents with hair fall, as elevated androgens can miniaturise hair follicles over time.
Alopecia is a genetic hair thinning which affects both men and women. In women, it presents as diffuse thinning across the crown of the scalp rather than the receding hairline pattern more common in men. It is driven by sensitivity to dihydrotestosterone (DHT), a derivative of testosterone, which miniaturises hair follicles over time.
This is a progressive condition that benefits from early treatment. Topical minoxidil is the most well-supported first-line treatment for androgenetic alopecia and is available over the counter. It works by prolonging the anagen growth phase and increasing follicle size.
A compromised scalp environment like chronic dandruff, or scalp inflammation, or fungal infection directly affects hair health.
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A compromised scalp environment like chronic dandruff, seborrheic dermatitis, scalp inflammation, or fungal infection directly affects follicle health. Hair follicles sit in the scalp and are directly impacted by the scalp's inflammatory state. Addressing scalp conditions often improves hair fall, particularly when the shedding is accompanied by itching, flaking, or visible scalp irritation.
Neem oil's antifungal and antibacterial properties make it particularly relevant for scalp health. Our article on returning to neem covers its specific benefits for scalp health in depth.
Chronic stress elevates cortisol levels, which can suppress hair follicle growth and push hairs into the resting phase. This is one of the mechanisms behind telogen effluvium following emotional stress.
The hair fall appears not in the moment of stress but two to four months later, which is why the connection between a stressful period and subsequent hair fall is often missed.
A blood panel checking ferritin, vitamin D, thyroid function (TSH, T3, T4), and zinc provides the most actionable information for most cases of unexplained hair fall.
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This is the most important step and the one most commonly skipped. Before purchasing supplements, treatments, or special shampoos identify whether there is an underlying cause to your hairfall. Like nutritional deficiency, thyroid dysfunction, iron deficiency, PCOS as it changes the entire approach.
A blood panel checking ferritin, vitamin D, thyroid function (TSH, T3, T4), and zinc provides the most actionable information for most cases of unexplained hair fall. This is worth doing before spending on supplements.
For hair fall caused by nutritional deficiency, diet and supplementation are the primary interventions. Iron-rich foods like leafy greens, legumes, lean meat. This combined with vitamin C for absorption are the most impactful dietary change for iron deficiency hair fall.
Vitamin D supplementation under medical guidance is effective for deficiency-related hair fall. A diet rich in protein is foundational as hair is made of keratin, which is protein, and inadequate dietary protein directly impacts hair growth.
Scalp massage increases blood circulation to the follicles and has been shown in research to improve hair thickness with regular practice. Four minutes of daily scalp massage using the fingertips. Either with or without oil is one of the simplest, most accessible interventions for hair fall. Our hair oiling guide covers how to combine massage with oiling for maximum benefit.
Bhringraj (Eclipta alba) has research supporting its role in promoting hair follicle growth. It is one of the most commonly used and best-evidenced Ayurvedic ingredients for hair fall.
Amla inhibits 5-alpha reductase, the enzyme that converts testosterone to DHT which makes it relevant for androgenetic alopecia specifically. Our Ayurvedic hair care products guide covers both these ingredients and where to find them in effective formulations.
Hair fall is almost always addressable, but only once its actual cause is identified. Treating telogen effluvium with androgenetic alopecia treatments, or supplementing biotin for iron deficiency hair fall, produces no result because the cause is not being addressed. Start with understanding, then act accordingly.
What are the most common causes of hair fall in women?
The most common causes are telogen effluvium (temporary shedding triggered by stress, illness, or nutritional deficiency), iron deficiency anaemia, vitamin D deficiency, thyroid dysfunction, hormonal changes related to pregnancy or PCOS, androgenetic alopecia (genetic hair thinning), and scalp conditions like seborrheic dermatitis. In most cases, hair fall has a specific, identifiable cause that responds to targeted treatment.
How do stress, diet, and hormonal changes affect hair loss?
Stress elevates cortisol, which can push hair follicles into the resting phase, causing noticeable shedding two to four months later.
Poor diet causes deficiencies in iron, vitamin D, zinc, and protein that directly impair follicle health.
Hormonal changes like postpartum oestrogen drop, thyroid dysfunction, PCOS, can disrupt the hair growth cycle in different ways.
Which vitamins and nutrients are important for healthy hair growth?
Iron (specifically ferritin levels), vitamin D, zinc, biotin, and dietary protein are the most important for hair growth. Iron and vitamin D deficiency are the most commonly missed causes of hair fall in Indian women.
Protein is foundational as hair is made of keratin protein and insufficient dietary protein directly impacts growth. Testing levels before supplementing is important, as excess supplementation of some nutrients can also trigger hair fall.
What treatments and lifestyle changes actually help reduce hair fall?
Addressing the underlying cause is the most effective intervention. For nutritional deficiency, targeted supplementation and dietary changes. For genetic thinning, topical minoxidil is the most evidence-backed treatment. Scalp massage improves circulation to follicles and has research behind it. Ayurvedic ingredients like bhringraj and amla have evidence supporting hair follicle health. Reducing scalp inflammation through appropriate shampoo and targeted scalp treatments also helps significantly.
When should someone consult a doctor for severe hair loss?
Consult a dermatologist if hair fall has been persistent for more than six months, if you notice patchy or circular hair loss.
Even if you notice hair fall is accompanied by scalp pain or visible inflammation, if there is progressive thinning at the crown or hairline, or if other symptoms suggest a hormonal or thyroid issue.
Genetic hair thinning responds best to early treatment than waiting.
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