Monsoon hair fall in Chennai: why it happens and what helps

Shedding rises for a few weeks after the rains start. Most of it settles on its own — here is when it does not.

More hair in the comb between October and January is common in Chennai, and for most people it is temporary. The north-east monsoon keeps scalps damp for hours at a time, which favours the flaking and itch that make shedding worse. The fevers that follow the rains cause a delayed shed of their own, two to three months later. Most of it settles.

What Chennai’s monsoon actually does to a scalp

Chennai gets its real rain late. The south-west monsoon between June and September mostly gives us humidity rather than downpours; the north-east monsoon from October to December is when the city genuinely gets wet, and November is usually the worst of it. Both halves of that year are humid, and humidity is the part that matters to a scalp.

A damp scalp is a hospitable one. Malassezia, a yeast that lives on everyone’s scalp, does better in warmth, sweat and sebum, and the combination of monsoon humidity and a helmet or a covered head gives it exactly that. The result is the flaking, itching and redness most people call dandruff, and which is often seborrhoeic dermatitis. It matters because the itch leads to scratching, the scratching inflames the scalp, and an inflamed scalp sheds more. Treating the flaking is frequently the most effective thing anyone does for monsoon hair fall.

The rain does something more mechanical too. Hair swells when wet and shrinks as it dries, and repeated cycles of that leave the shaft weaker. Wet hair stretches further before it breaks, so combing it hard, tying it up damp or pushing it under a helmet on a wet morning breaks hair that would otherwise have stayed. Breakage is not shedding, and you can tell them apart: a shed hair has a small pale bulb at the root, a broken one does not.

One thing worth dismissing. Chennai’s hard water gets blamed for a great deal every monsoon. There is no good evidence that hard water causes hair loss. It does leave mineral deposits that make hair feel rough, tangly and dull, which is a real complaint but a different one.

The fever nobody connects to their hairbrush

Here is the pattern we see every year, and almost nobody arrives having made the connection themselves.

The rains leave standing water across the city, mosquito-borne and viral fevers rise through the weeks that follow, and a large number of people spend a few days in bed in November or December. A physical stress of that kind — a high fever, an infection, surgery, childbirth, a crash diet, severe anaemia — can push a large group of follicles out of their growing phase and into the resting phase all at once.

Resting hairs are not shed immediately. They sit for roughly two to three months and then come out, often in what feels like an alarming quantity, in the shower and on the pillow. Which is why the hair fall that frightens people in January and February usually belongs to the fever they had in November and had entirely stopped thinking about.

“The hair you are losing in January was decided in November. That lag is the reason the cause is so often missed — and the reason panic buying of shampoos in January proves nothing either way.”

This kind of shedding is diffuse, comes from all over the scalp rather than from patches, and typically settles over a few months once the trigger has passed. It is one of the few hair complaints where the honest advice is to treat the cause, be patient, and not start four products at once.

What actually helps through the wet months

Wash more, not less. People with flaking often wash less for fear of losing hair, which lets sebum and yeast build up and makes the flaking worse. A medicated anti-dandruff shampoo used properly — worked into the scalp, left for a few minutes, not just poured over the lengths — treats the scalp rather than the hair.

Dry your scalp before tying your hair up or putting on a helmet. Wipe the inside of the helmet and let it air; it spends the monsoon damp. Do not share combs, towels or helmets, which is how fungal scalp infections travel through a household.

Be gentle when hair is wet. A wide-toothed comb, no tight ponytails on damp hair, and no vigorous towel-drying. If you get caught in the rain, rinse the scalp rather than leaving rainwater in it.

Eat properly through a season when appetite drops after illness. Iron, protein and overall intake matter more to hair than any topical product, and a crash diet begun in January will add a second shed on top of the first.

When it is not the monsoon

Some things do not belong to the season. A parting that is visibly widening, or scalp showing through where it did not, suggests pattern hair loss rather than a temporary shed. Distinct bald patches, especially with smooth or scaly skin, need examining rather than treating at home. Scalp pain, burning, tenderness, pustules or crusting should be seen promptly. Shedding that has not settled after three or four months deserves a proper look, as does hair loss alongside fatigue, breathlessness, heavy periods, or a change in weight or cycle — those point at iron, thyroid or hormonal causes that a shampoo cannot reach.

Children with patchy loss and scaling need medical assessment rather than an adult anti-dandruff shampoo; fungal scalp infection is common, contagious and treated quite differently.

If you are not sure which of these you have, that is the reason to have it looked at. Nearly all of monsoon hair fall is temporary. The part that is not gets easier to help the earlier it is identified.

Reviewed by the Kremlin Aesthetics clinical team. Last updated 18 August 2026.