Hair Fall Causes and Treatment: What's Normal, What's Not, and What Helps

By the Cosmosentials Team

Finding strands on your pillow, a thick knot of hair in the bathroom drain, or a comb that looks fuller than it used to can be unsettling. The good news is that some shedding is perfectly normal, and many causes of hair fall are treatable, especially when you catch them early.

Most people lose around 50 to 100 hairs a day as part of the natural hair cycle. If you're losing far more than that, or your parting is widening, your ponytail is getting thinner or bald patches are appearing, it's time to look for the cause instead of just switching shampoos. This guide covers the most common causes of hair fall, how doctors find them, which treatments have real evidence behind them, and the everyday habits that help.

Key takeaways

• Shedding 50–100 hairs a day is normal. A sudden or lasting increase is not.
• The usual suspects are stress or illness, nutritional deficiencies, hormonal and thyroid problems, genetics, scalp conditions and hair-care habits.
• Treatment works best when it's matched to the cause, and it takes 3–6 months to show results.
• Seeing a dermatologist early protects more hair, especially in pattern hair loss.

Is it normal shedding or real hair fall?

Every hair follows a cycle: a long growth phase that lasts for years, a short transition phase, and a resting phase of about three months, after which the hair sheds and a new one starts growing from the same follicle. At any time, roughly 85–90% of your scalp hair is growing and the rest is resting, which is why a steady trickle of shedding is normal.

Hair fall becomes a concern when that balance tips, for example when many hairs enter the resting phase together, or when follicles gradually shrink and produce finer, shorter hairs. Watch out for:

• Noticeably more hair on your pillow, comb or bathroom floor for several weeks
• A widening parting, a receding hairline or thinning at the crown
• A ponytail that feels thinner than before
• Round or oval bald patches
• Itching, burning, flaking or redness on the scalp along with hair fall

A simple habit helps: take clear, well-lit photos of your hairline, parting and crown once a month. They make gradual thinning easier to spot, and they give a dermatologist something concrete to assess, especially during an online consultation.

One more distinction: hair breakage, where short, uneven pieces snap off along the strand because of heat, bleaching or rough combing, can look like hair fall but is a different problem with a different fix.

Common causes of hair fall

Hair fall rarely has just one cause. Genetics, nutrition, hormones, stress and hair-care habits often overlap, which is why guessing so rarely works. These are the most common culprits.

1. Stress, illness and major life events

Shedding that starts two to three months after a trigger is one of the most common patterns doctors see. A high fever or serious infection (such as dengue, typhoid or COVID-19), surgery, childbirth, rapid weight loss or a period of intense stress can push many hairs into the resting phase at the same time. The result is sudden, diffuse shedding all over the scalp, known as telogen effluvium. It usually settles once the trigger has passed, though regrowth takes months.

2. Nutritional deficiencies

Hair follicles are among the most active tissues in the body, so they react quickly when nutrition falls short. Low iron stores (ferritin), vitamin D, vitamin B12, zinc and too little protein are all linked with increased shedding. Iron deficiency and anaemia are particularly common among women in India, and vitamin B12 deficiency is common in vegetarians. Crash diets and skipped meals make things worse. A simple blood test can show whether a deficiency is involved, which is far better than guessing and self-supplementing.

3. Hormonal and thyroid problems

An underactive or overactive thyroid can cause diffuse thinning, often alongside tiredness, weight changes or dry skin. In women, PCOS (polycystic ovary syndrome) can raise androgen levels, leading to thinning at the crown or parting, often with acne, irregular periods or excess facial hair. Hair fall after childbirth and around menopause is also hormone-driven. Postpartum shedding is common and usually temporary, while menopausal thinning may need treatment.

4. Genetics (pattern hair loss)

The most common cause of long-term thinning is androgenetic alopecia, or pattern hair loss. In people who are genetically sensitive, hormones called androgens gradually shrink hair follicles, so each new hair grows back finer and shorter. In men it typically shows up as a receding hairline and a thinning crown, and it can begin as early as the late teens or twenties. In women it usually appears as a wider parting and overall thinning, while the frontal hairline is mostly preserved. Pattern hair loss is progressive, so starting treatment early makes a real difference.

5. Scalp conditions

A healthy scalp is the foundation of healthy hair. Persistent dandruff (seborrhoeic dermatitis), fungal infections, psoriasis and inflamed hair follicles can all cause itching, flaking and extra shedding. Scalp infections can be more common in warm, humid weather and need proper antifungal treatment, not just oil or a regular shampoo. Left untreated, some can damage the follicles.

6. Alopecia areata (patchy hair loss)

Smooth, round or oval bald patches that appear suddenly may be alopecia areata, an autoimmune condition in which the immune system mistakenly attacks hair follicles. It isn't contagious, and many people see regrowth with the right treatment, though the course can be unpredictable. It needs a dermatologist's diagnosis because the approach is very different from other types of hair fall.

7. Hair-care habits

Everyday habits can quietly add to hair loss. Tight ponytails, braids and buns pull on the follicles and can lead to traction alopecia over time. Frequent heat styling, bleaching, colouring, rebonding and smoothening treatments weaken the hair shaft and cause breakage, and rough towel-drying or combing wet hair adds to the damage.

8. Medicines and medical treatments

Some medicines list hair fall as a side effect, including certain drugs for cancer, blood thinning, high blood pressure, depression, epilepsy and severe acne. If your hair fall began after starting a new medicine, speak to your doctor before making any changes, and never stop prescribed medication on your own.

Hair fall in men and women: what's different?

• Men: a receding hairline at the temples and a thinning crown are the classic signs of pattern hair loss. Diffuse shedding can also come from stress, illness or deficiencies.
• Women: the hairline usually stays in place, but the parting widens and the ponytail gets thinner. Iron deficiency, thyroid problems, PCOS, pregnancy and menopause are frequent contributors.

In both cases, the pattern of loss gives important clues about the cause, which is why a proper examination matters.

How dermatologists find the cause

Treating hair fall properly starts with identifying why it's happening. A dermatologist will usually:

• Ask about your diet, stress, medicines, recent illnesses, menstrual and family history and hair-care routine
• Examine your scalp and the pattern of thinning
• Look closely at hair shafts and follicles using a dermatoscope (trichoscopy)
• Advise blood tests when needed, such as haemoglobin, ferritin, thyroid (TSH), vitamin D and vitamin B12, and sometimes hormone tests
• Occasionally recommend a fungal test or a scalp biopsy

A clear history and good photos of your scalp, hairline and parting can help a dermatologist guide you effectively even in an online consultation.

Hair fall treatment: what actually works

The right treatment depends entirely on the cause. Here is what dermatologists commonly use, in plain language.

Treat the underlying cause first

If your hair fall is triggered by iron, vitamin D or B12 deficiency, a thyroid imbalance, PCOS or a scalp infection, correcting that problem is the foundation of treatment. For temporary shedding after illness, stress or childbirth, removing the trigger and giving your hair time usually does the job.

Minoxidil

Topical minoxidil is one of the most widely used treatments for pattern hair loss in men and women. It helps prolong the growth phase and increase follicle size. Visible results usually take 3 to 6 months, you may notice a temporary increase in shedding in the first few weeks, and the benefits last only as long as you keep using it. Ask your dermatologist which strength suits you, and check with your doctor before using it during pregnancy or breastfeeding.

Prescription medicines

For men with pattern hair loss, doctors may prescribe oral finasteride, which reduces the hormone (DHT) that shrinks follicles. For women, the options depend on hormones, age and pregnancy plans. These are prescription-only medicines with possible side effects, so they should be started and monitored only by a doctor.

Medicated shampoos and scalp treatments

If dandruff, a fungal infection or psoriasis is the problem, medicated shampoos (for example, those containing ketoconazole or zinc pyrithione) and other targeted treatments can calm the scalp and reduce shedding. Use them exactly as your doctor advises.

In-clinic procedures

PRP (platelet-rich plasma) therapy and low-level laser therapy are used as add-ons for some types of hair thinning. Results vary from person to person, and they work best alongside medical treatment, not instead of it. For advanced, stable pattern baldness, a hair transplant may be an option, and a specialist can assess whether you're a good candidate. Patchy hair loss from alopecia areata is managed differently, with treatments that calm the immune response.

Supplements: helpful only when needed

Supplements help when tests show a real deficiency, such as low iron, vitamin D or B12. Taking them without a reason rarely helps and can sometimes cause harm. For example, high-dose biotin isn't proven to improve hair in people who aren't deficient, and it can interfere with some blood tests, including thyroid tests. Test first, then supplement under guidance.

Be realistic about timelines

Hair grows roughly a centimetre a month, so no treatment works overnight. Give any plan at least 3 to 6 months before judging it, and be wary of products that guarantee regrowth in a few weeks.

Everyday habits that support healthy hair

Good habits can't override genetics, but they support your hair and any treatment you're on.

• Eat enough protein and iron-rich foods. Think dal, eggs, paneer, curd, chana, rajma, sprouts, fish or chicken, plus green leafy vegetables, nuts and seeds. Pair iron-rich foods with vitamin C (amla, lemon, guava, oranges) to help absorption.
• Avoid crash diets. Sudden, severe cuts in food intake are a classic trigger for shedding.
• Wash with a mild shampoo. Choose one suited to your scalp type and wash as often as your scalp needs, especially in humid weather.
• Be gentle with wet hair. Pat it dry instead of rubbing, and use a wide-toothed comb.
• Loosen your hairstyles. Avoid tight ponytails, braids and buns every day.
• Limit heat and chemical treatments. Cut back on straighteners, curling tools, bleaching and rebonding.
• Oil with care. A gentle oil massage can feel relaxing and may reduce breakage in the lengths, but it won't fix genetic, hormonal or nutritional causes, and heavy oil left on a flaky, itchy scalp can make dandruff worse.
• Look after sleep and stress. Aim for 7–8 hours of sleep, regular exercise and a stress-relief habit that works for you.

Common hair fall myths

• “Washing my hair often makes it fall.” The hairs you see in the shower were already on their way out. Skipping a wash only lets them pile up until the next one.
• “Cutting or shaving makes hair grow back thicker.” Thickness is set by the follicle under the skin, not by the cut end of the hair.
• “Every case of hair fall is a vitamin deficiency.” Deficiencies are one possible cause. Get tested instead of guessing.
• “Wearing a helmet or cap causes baldness.” Not on its own. Just keep them clean and avoid constant tight pressure on the scalp.
• “Onion juice, methi or rosemary oil will cure hair fall.” Evidence for real regrowth is limited. If you try them, patch-test first and don't let them delay proper treatment.

When to see a dermatologist

Don't wait it out if you notice any of these:

• Hair fall that lasts longer than two to three months or suddenly becomes heavy
• A visibly widening parting, a receding hairline or a thinning crown
• Round or patchy bald spots
• An itchy, painful, red, scaly or pus-filled scalp
• Hair fall along with fatigue, weight changes, irregular periods, acne or excess facial hair
• Hair fall that began after starting a new medicine
• Hair loss in a child or teenager

Pattern hair loss, in particular, responds best to early treatment, because treatment is better at keeping the hair you have than at bringing back what's already gone.

Get expert guidance for your hair fall

If you're unsure what's behind your hair fall, you don't have to work it out alone. At Cosmosentials, you can consult a dermatologist online, talk through your symptoms and history, and get guidance on the treatment and routine that suit your scalp. When you're ready to build your routine, explore our dermatologist-backed haircare range.

This article is for general information only and isn't a substitute for professional medical advice, diagnosis or treatment. Always speak to a qualified doctor about your condition.

Frequently asked questions

How many hairs fall in a day is normal?

About 50 to 100. If you're losing far more than that for several weeks, or your hair looks visibly thinner, it's worth getting checked.

Can hair fall be reversed?

It depends on the cause. Hair fall from stress, illness, childbirth or nutritional deficiencies is usually temporary and improves once the cause is treated. Pattern hair loss can often be slowed, and sometimes partly regrown, with treatment, though treatment usually needs to continue. Rarer scarring conditions can cause permanent loss, which is why early diagnosis matters.

How long does hair fall treatment take to work?

Most treatments need at least 3 to 6 months before the improvement is clear, and up to 12 months for the full effect. Reduced shedding is usually the first sign.

Which deficiency causes the most hair fall?

Low iron stores are one of the most common nutritional causes, particularly in women, followed by vitamin D, vitamin B12 and zinc. A blood test can confirm which one, if any, applies to you.

Can stress really cause hair fall?

Yes. Severe or prolonged stress can push more hairs into the resting phase, and you typically notice the shedding two to three months later. It's usually temporary, but it can add to other causes such as pattern hair loss.

Why does hair fall seem worse after the monsoon?

Some people notice more shedding as the seasons change. Humid, sweaty weather can also aggravate dandruff and scalp infections, which increase shedding. Keep your scalp clean and see a dermatologist if heavy shedding continues for more than a few weeks.