Hair fall after dengue, typhoid or COVID: will it come back?

Key takeaways

• Fever-related shedding usually starts two to three months after the illness. After dengue, it has been reported as early as the first month.
• The American Academy of Dermatology reports that after COVID, about 20% of people in studies developed temporary shedding, and most saw full regrowth within six to eight months.
• The illness itself is only one trigger. Weight loss, poor appetite and low protein during recovery add to it.
• In my experience, hair loss after an illness often responds well.
• If the shedding unmasks pattern thinning, the shedding settles but the pattern does not, and that part needs a plan.

Why does my hair fall months after the fever has gone?

This timing confuses almost everyone. You get dengue in September, feel normal by October, and then in November or December your hair starts coming out in handfuls. People come to me convinced it is a new disease.

See, what happens is, hair grows in cycles. Normally only a small share of follicles are resting at any one time. A serious illness, especially with high fever, is a shock that pushes many growing follicles into the resting phase together. Resting hairs stay put for about three months and then shed. So the hair fall you see today is the result of an illness a few months ago, not a new problem. DermNet describes illness with fever as one of the most common triggers of this pattern, which we call telogen effluvium.

Is dengue hair loss different?

After the monsoon, dengue is one of the most common reasons I see people in Mumbai and Thane with hair fall. In some people, dengue-related shedding appears to start a little earlier than the classic pattern. Researchers studying the 2014 to 2015 dengue epidemic in Taiwan noted an unusually high frequency of scalp hair shedding, starting as early as the first month after infection, and without scarring. Their laboratory work showed that the dengue virus can infect cells of the hair follicle, which may partly explain the earlier timing. I would add one caution: this is laboratory evidence. It does not tell us how much hair any one person will lose.

What reassures me is the outcome. The shedding they described was non-scarring, which means the follicles survive and can regrow.

What about typhoid and COVID?

Typhoid usually means days or weeks of high fever, loss of appetite and weight loss, often with a long course of antibiotics. Each of these is a recognised trigger for telogen effluvium, so shedding two to three months later is common. There is less specific research on typhoid than on COVID, but the mechanism and the recovery pattern are the same.

COVID has been studied in more detail. The American Academy of Dermatology reports: - Shedding usually begins two to three months after infection. - It can happen even after mild COVID. - It typically lasts three to six months. - Most people see full regrowth within six to eight months of the shedding starting.

A 2022 review in the Journal of Pakistan Association of Dermatologists found an average onset of about 63 days after infection, and noted that many affected patients also had vitamin D deficiency, anaemia, hypothyroidism or type 2 diabetes. I find that a useful reminder. The infection may start the shedding, but other health issues can keep it going.

How long will it last, and what does recovery look like?

The British Association of Dermatologists notes that telogen effluvium usually gets completely better without treatment, though regrowth to normal thickness can take many months. So patience is part of the treatment here, even if nobody likes hearing that.

What can I do to help my hair recover?

I will be straight with you. Hairs that have already gone into the resting phase will fall, and nothing stops that. What you can do is make sure nothing else keeps the shedding going.

1. Eat enough protein while you recover. Appetite is often poor for weeks after dengue or typhoid. Build each meal around a protein source: dal, chana, rajma, paneer, curd, eggs, soya chunks, sprouts, fish or chicken.
2. Get the right blood tests if shedding is heavy or prolonged. Iron stores (ferritin), haemoglobin, thyroid function and vitamin B12 are the most useful. My article on blood tests for hair fall explains each one.
3. Do not start high-dose supplements blindly. Correcting a real deficiency helps. Taking extra iron or biotin when you are not deficient has no proven benefit, and too much iron can cause harm.
4. Be gentle with your hair. Avoid tight hairstyles, heat styling and chemical treatments for a few months.
5. Give it time. Judge progress over months, not days. A photo of your parting every four weeks, in the same light, is more reliable than counting hairs in the bathroom.

When is it not just post-fever shedding?

Look for these signs that something else is going on: - Shedding continues beyond six months. - Your hair is thinner over the top of the scalp or at the temples than at the back. - You see round, smooth bald patches (this can be alopecia areata, which the American Academy of Dermatology notes can flare after COVID). - You have a family history of baldness and your hairline or crown has changed.

That last point is very important to understand. A fever does not cause pattern hair loss. But a heavy shed can make existing pattern thinning visible for the first time. Then the post-fever part recovers, and the pattern part needs treatment. This is why I say: if you're born with hair which is thin, it cannot change, but hair you have lost recently can come back. Read will my hair grow back to understand the difference.

How we approach this at Dr Tvacha

For most people after dengue, typhoid or COVID, the right plan is a clear explanation, one or two targeted blood tests, good food and patience. At a Rs 499 hair diagnosis at our Thane, Andheri, Bandra or Dahisar centre, my team and I check whether you are dealing only with post-illness shedding or with pattern thinning underneath, and we tell you which. If treatment is needed, it is quoted in writing first, and you decide. See our hair page or find a centre near you.

Written by

Dr Amit KarkhanisAesthetic Physician · MBBS, Dip. Dermatology (UK) · Reg. No. 2001/02/1124

Founder of Dr Tvacha, practising in Thane since 2005. Leads the weight loss and hair programmes.