Hair fall that starts two or three months after a fever is common and usually temporary. A dermatologist explains why it happens, how long it lasts and when to get checked.
Many people in Karachi notice their hair coming out in handfuls a couple of months after a bad fever. Typhoid, dengue, COVID and even a severe flu can all do this. It is frightening, but in most cases it is temporary, and knowing why it happens makes the wait much easier.
At the clinic: If your shedding has not settled or you want the cause confirmed, see our page on hair fall and hair loss treatment in Karachi.
Why a fever makes your hair fall
Every hair on your scalp goes through a growing phase that lasts several years, then a short resting phase, after which it sheds and a new hair starts in the same follicle. At any time, around 85 to 90 percent of your hairs are growing. A high fever, a serious infection, surgery, a crash diet or major stress can push a large number of growing hairs into the resting phase all at once. Doctors call this telogen effluvium.
The resting phase lasts about three months, so the shedding does not start while you are ill. It usually begins six to twelve weeks after the fever, often just when you feel fully recovered. That delay is why so many people never connect the two.
What it looks like
- Hair falls evenly from all over the scalp rather than in patches.
- You find more hair in the shower, on your pillow and in your brush, often with a small white bulb at the root.
- Your ponytail feels thinner, but the scalp itself looks healthy, with no redness, scaling or bald spots.
- Eyebrows and body hair are usually not affected.
Losing 50 to 100 hairs a day is normal. After a fever, some people lose two or three times that for a few months.
How long does it last?
For most people, the heavy shedding lasts three to six months and then slows on its own. New hair starts growing at the same time, and you may notice short new hairs along the hairline and parting. Because hair grows about one centimetre a month, it takes six to twelve months before your hair feels full again. The follicles are not damaged, so the hair does come back.
When it is not just post-fever shedding
See a dermatologist rather than waiting it out if any of these apply to you:
- The shedding continues beyond six months.
- You see round bald patches, a widening parting or a receding hairline.
- Your scalp is itchy, scaly, red or sore.
- You have other symptoms such as constant tiredness, weight change, irregular periods or feeling cold all the time.
- Your hair was already thinning before you got sick.
A fever can also bring other problems to the surface. Low iron, low vitamin D, a thyroid problem or hereditary thinning can all make the shedding heavier or stop the hair from recovering properly. All of these are common in Pakistan, especially in women. If you are a new mother, read our guide to postpartum hair fall, which works in a very similar way.
What helps while you wait
- Eat enough protein. Hair is made of protein, and many people eat very little while they are ill and recovering. Eggs, daal, chicken, fish and yoghurt all help.
- Get your blood tested. Ferritin (your iron stores), vitamin D, vitamin B12 and thyroid function are the usual tests. Correcting a deficiency makes a real difference to how quickly hair recovers.
- Be gentle with your hair. Avoid tight ponytails, daily heat styling and harsh treatments such as rebonding or keratin until the shedding settles.
- Skip random supplements and oils. Biotin tablets and hair oils will not stop this kind of shedding, and high dose biotin can upset some blood test results, including thyroid tests.
- Keep washing normally. Washing does not cause the loss. The hairs that come out in the shower were already going to shed.
Does it need treatment?
Simple post-fever shedding often recovers with nothing more than good nutrition and correcting any deficiency. Treatment is worth considering if the shedding is slow to settle, if regrowth looks thin, or if a second cause such as hereditary thinning is also present. Options a dermatologist may suggest include topical minoxidil, PRP for hair and exosomes for hair, which aim to support the growing phase. These work best when the cause has been found first, which is why we start with a proper assessment rather than a package of sessions.
How Dr. Fehmida approaches it
Dr. Fehmida Arif is a consultant dermatologist in Clifton, Karachi, with more than thirty-five years of experience. At your visit she examines your scalp and hair, asks about your illness, diet and medicines, and orders blood tests only where they are needed. You leave knowing whether this is temporary shedding, something else, or both, and what will actually help. If you are unsure who to see, our guide on trichologist or dermatologist for hair loss explains the difference.
Frequently asked questions
Can typhoid cause hair loss?
Yes. The high fever of typhoid can push many hairs into the resting phase at the same time, and the shedding usually starts six to twelve weeks later. It is normally temporary.
Does hair grow back after dengue?
In most cases, yes. Shedding after dengue slows down after three to six months, and the hair regrows over the following months.
Is hair loss after COVID permanent?
Usually not. It behaves the same way as shedding after any high fever. If it lasts longer than six months, see a dermatologist to check for another cause.
Should I cut my hair short?
It is not necessary. A shorter cut can make hair look fuller while it recovers, but it does not change how much falls.
Consultant Dermatologist and Laser Skin Specialist, MBBS, MCPS. Over 35 years in dermatology, five of them in Zurich, practising in Clifton, Karachi since 1999.
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