Key takeaways
- Seasonal changes in shedding have been documented: a Swiss study of 823 women found the most resting hairs in summer and the fewest in late winter.
- There is no good research on monsoon shedding specifically. The likely causes are scalp flares, breakage and illness, not the rain.
- Shedding after a monsoon fever often appears around September to November, two to four months after the illness.
- Simple habits help: drying hair properly, washing after getting drenched or sweaty, and keeping dandruff under control.
- Shedding that lasts beyond the season, or comes with patches or a widening parting, is not "just the monsoon".
Is seasonal hair fall real?
Some of it, yes. Hair follicles in many mammals follow seasonal cycles, and humans show a weaker version. In a six-year study from Zürich, researchers looked at hair samples from 823 healthy women who complained of hair loss. They found a yearly rhythm: the highest share of resting (telogen) hairs in summer, a smaller peak in spring, and the lowest in late winter. Because resting hairs fall a few months later, this can show up as more hair in the comb at certain times of year.
But that study was done in Switzerland, which has very different seasons from ours. We do not have equivalent research for the Indian monsoon. So my honest answer is: seasonal variation exists, but how much of your monsoon hair fall it explains, sitting in Thane or Bandra, nobody really knows.
What actually causes hair fall in the rains?
See, what happens is, several small things stack up between June and September, and each adds a little.
| Monsoon factor | What it does | Type of hair loss |
|---|---|---|
| Humidity and sweat | Dandruff and seborrhoeic dermatitis flare; itch leads to scratching | Shedding and breakage, reversible |
| Hair staying damp for hours | Wet hair is weaker and tangles; rough combing snaps it | Breakage of the lengths |
| Getting drenched on the commute | Damp scalp under a helmet or dupatta; sweat and grime build up | Scalp irritation, fungal infection risk |
| Monsoon fevers | Dengue, malaria, typhoid and viral fevers trigger telogen effluvium | Diffuse shedding 2 to 4 months later |
| Less sunlight, irregular meals, less exercise | Small effects on overall health and diet | Minor contribution |
Scalp flares. Heat, humidity and sweat make an oily scalp more prone to dandruff and seborrhoeic dermatitis. Cleveland Clinic notes that seborrhoeic dermatitis can cause hair shedding from scratching in affected areas. Read dandruff and hair fall.
Breakage. When hair stays wet for long, it tangles and breaks more easily with combing. Broken pieces in the drain look like hair fall, but they have no white bulb at the end and they did not come from the root.
Fever shedding. This is the big one, and it is often missed. Fevers are a classic trigger for telogen effluvium. DermNet notes that shedding usually starts two to four months after the triggering event and tapers back over six to nine months. So a fever in July can show up as heavy hair fall in October, after the rains are over, and people blame the weather instead of the illness. Read hair fall after dengue, typhoid or COVID.
So what is myth?
- "Rain water makes hair fall." Rain water does not damage the follicle. Getting caught in the rain is fine, as long as you wash and dry your hair afterwards. Mumbai would be completely bald otherwise.
- "Acid rain causes baldness." There is no evidence for this in everyday city rain exposure.
- "Oiling heavily protects against monsoon hair fall." In humid weather, heavy oil left on the scalp can aggravate dandruff for some people. Read hair oiling myths and facts.
- "Monsoon hair fall always stops on its own." Scalp flares and breakage settle with care. Shedding after a fever usually recovers. But pattern hair loss does not stop with the season, and the monsoon is sometimes simply when people first notice it.
What monsoon hair care actually helps?
- Wash after getting drenched or very sweaty, especially if you wear a helmet. A mild shampoo is fine for frequent washing.
- Dry the scalp properly. Towel gently, then air dry or use a dryer on a cool setting. Do not tie up or plait wet hair.
- Keep a medicated anti-dandruff shampoo (ketoconazole, zinc pyrithione or selenium sulphide) in rotation two or three times a week if you are prone to flakes. Leave it on for five minutes.
- Use a conditioner on the lengths and a wide-tooth comb, starting from the ends.
- Wear a thin cotton cap under your helmet, and let it dry between rides.
- Avoid tight hairstyles on damp hair, which pull and break more easily.
- Keep protein in your diet, and recover properly after any fever, with enough food and rest.
When is it more than the monsoon?
Come and see a doctor if: - Heavy shedding lasts more than two to three months, or continues well after the rains. - You notice round bald patches, a widening parting, or receding temples. - The scalp is red, painful, very itchy, or has pus or scaly patches with broken hairs, particularly in children. - You had a fever in the last few months and the shedding is heavy. It is worth checking blood count, iron stores and how well you have recovered.
How we approach this at Dr Tvacha
Before blaming the rain, I want to find the real cause. That is very important to understand, because each cause has a different fix. At a hair diagnosis at our Thane, Andheri, Bandra or Dahisar centre, I take a timeline of the past six months, look for illness, examine the scalp for flares or infection, and check whether the shedding is from the root or breakage, and whether pattern hair loss sits underneath. Often the plan is just scalp care and reassurance. The hair plan page explains how the Rs 499 diagnosis works.
Frequently asked questions
Why does my hair fall more in the monsoon?
Usually a mix of things. Humidity and sweat cause dandruff flares and itching, damp hair tangles and breaks more easily, and fevers common in the rains can trigger heavy shedding two to four months later. Seasonal variation in shedding has also been described in research, though not specifically for the Indian monsoon. Rain itself does not damage the hair root.
How long does monsoon hair fall last?
Breakage and dandruff-related shedding usually settle within a few weeks of better scalp care, once the humidity drops. Shedding after a monsoon fever typically appears two to four months after the illness and tapers over six to nine months. If heavy shedding continues beyond that, or your parting or hairline is changing, another cause such as pattern hair loss should be checked.
Is it bad to get my hair wet in the rain?
Not by itself. Rain water does not harm hair follicles. The problem is leaving your hair and scalp damp for hours, especially under a helmet or tied up, which can aggravate dandruff and lead to breakage. Wash with a mild shampoo when you get home, dry the scalp properly, and do not tie your hair while it is wet.
Should I wash my hair less often in the monsoon to reduce hair fall?
No. Washing does not cause hair loss. The hairs that come out in the shower were already shed and would have fallen anyway. In humid weather, sweat and oil build up faster, so many people need to wash more often, not less, to keep dandruff and itching under control. Use a mild shampoo for frequent washing and condition the lengths.
My hair started falling in October. Was it the monsoon?
Possibly, but think back two to four months. A fever such as dengue, malaria, typhoid or a bad viral illness in July or August is a common cause of heavy shedding in October and November. Stress, weight loss or a new diet can do the same. This shedding usually recovers, but if it is heavy, get blood tests and a scalp check.
Written by
Dr Amit KarkhanisAesthetic Physician · MBBS, Dip. Dermatology (UK) · Reg. No. 2001/02/1124Founder of Dr Tvacha, practising in Thane since 2005. Leads the weight loss and hair programmes.
Sources
- Seasonality of Hair Shedding in Healthy Women Complaining of Hair Loss (Dermatology, 2009)
- Telogen effluvium (DermNet)
- Telogen Effluvium (StatPearls, NCBI Bookshelf)
- Seborrheic Dermatitis (Cleveland Clinic)
- How to treat dandruff (American Academy of Dermatology)
This article is for general education and does not replace a consultation. Medicines and treatments are prescribed only after a doctor's assessment. Last reviewed 25 October 2026.