You had dengue, typhoid, COVID or a bad fever, and got better. Then, a month or two later, hair started coming out in handfuls. Hair fall after fever is common and frightening, and it usually has a harmless explanation. Many readers search for it as “bukhar ke baad baal jhadna”.
For the other types of hair loss, tests and treatment, see our complete guide to hair loss in India.
Why hair fall after fever starts weeks or months later
Hair falls late because a fever or shock stops hairs growing, but they only fall out when new hairs push them out, about two to three months later. Doctors call this telogen effluvium: excessive shedding of resting hairs.
Each hair grows for years, then rests for a few months. DermNet, a dermatologist-edited reference, says that normally about 85% of scalp hairs are growing and about 15% are resting. A shock to the body, such as a high fever, can push as many as 70% of growing hairs into the resting phase at once.
DermNet describes increased hair fall 2 to 4 months after the trigger, and an Indian dermatology review in the Indian Journal of Dermatology, Venereology and Leprology (IJDVL) says 2 to 3 months. A StatPearls review gives a wider range of 1 to 6 months. By then you may have fully recovered and not connect the two.
The reassuring part: DermNet notes that, paradoxically, this kind of hair fall is a sign of regrowth. Each club-shaped hair on your comb is being replaced by a new one.
How much shedding is typical, and how long it lasts
Losing 50 to 100 hairs a day is normal, according to the American Academy of Dermatology (AAD). In telogen effluvium the number rises sharply: the 2009 IJDVL review describes nearly 100 to 1,000 hairs a day. DermNet says it can affect up to half of the scalp hair, yet it does not cause complete baldness.
Most people see thinner hair overall, sometimes at the temples, rather than a bald spot. Photos of your parting taken a month apart tell you more than counting hairs daily.
| Time after the illness or trigger | What usually happens |
|---|---|
| First 1–2 months | Hair looks normal. Growth has paused in many follicles, but nothing shows yet. |
| About 2–3 months (range 1–6) | Shedding starts, often suddenly, with hair on the pillow, comb and drain. |
| About 3–6 months | Shedding peaks and then slows. Indian reviews expect it to stop within 3–6 months once the trigger has passed. |
| About 6–9 months | The AAD says hair tends to regain its normal fullness within 6 to 9 months. Short new hairs may show along the hairline. |
| Up to about a year | Complete recovery can take this long, because hair grows slowly. |
How the sources compare. They measure different things: the Indian IJDVL reviews give when the fall stops (3 to 6 months), while the AAD and DermNet give when hair looks full again (6 to 9 months).
Common triggers in India, and how good the evidence is
Almost any major shock to the body can trigger this shedding. The evidence comes from clinical observation and case series, not trials; a dermatology book chapter notes there are no data defining how much risk each trigger carries.
- High fever of any cause. The AAD lists high fever and recovering from a feverish illness. The IJDVL reviews name severe fevers such as malaria among the commonest triggers, and the same book chapter lists typhoid and tuberculosis.
- Dengue. In a Taiwanese series of 14 people seen after a 2015 outbreak, shedding began on average 2.1 months after dengue and lasted about 2.9 months. Ten of the 13 women also had pattern thinning, which the shedding had made more noticeable. The study is small, but the timing matches other fevers.
- Coronavirus disease 2019 (COVID-19). A 2022 systematic review found shedding began on average about 56 days after COVID-19, slightly sooner than with other triggers. Where follow-up was reported, it had settled in all 86 patients, within about 1 to 6 months.
- Childbirth. The AAD says new mothers may notice heavy shedding about two months after birth, peaking around four months. An Indian review estimates it affects one-third to one-half of women after childbirth.
- Major surgery, an accident or heavy blood loss. All are listed by the AAD, DermNet or the Indian reviews.
- Crash diets and rapid weight loss. The AAD lists losing 20 pounds (about 9 kg) or more. The 2013 IJDVL review describes a crash diet that can trigger shedding as under about 0.8 g of protein per kg of body weight and under 1,200 kcal a day. Very strict pre-wedding diets or long fasts may come close to this.
- Stopping the contraceptive pill. The AAD, DermNet and IJDVL all list it.
- Some medicines. StatPearls lists some heart and blood pressure tablets, blood thinners, some seizure and thyroid medicines, and acne tablets from the vitamin A family.
- Thyroid problems. DermNet lists both an underactive and an overactive thyroid. Hair usually regrows once the thyroid problem is treated.
- Severe stress, such as caring for a sick relative or losing a job (AAD).
What Indian data show. A hospital study of 180 women with diffuse hair loss in Kalaburagi, Karnataka, found telogen effluvium in 64%. Among the 130 women with this shedding, the probable trigger was psychological stress in 37%, a recent fever in 12%, a medicine in 9%, a crash diet in 6% and childbirth in 5%. No cause could be found in about a quarter, and 60% of those tested had low haemoglobin. Reviews agree that in up to a third of cases no trigger is identified.
Is it shedding, pattern hair loss or alopecia areata?
Other types of hair loss look different.
| Feature | Shedding after illness | Pattern hair loss | Alopecia areata |
|---|---|---|---|
| How it starts | Suddenly, 1–6 months after a trigger | Slowly, over years | Suddenly, as one or more patches |
| What you see | Lots of hair falling with the root; overall thinning, sometimes at the temples | Men: receding hairline or thin crown. Women: widening parting | Round, smooth bald patches; sometimes in eyebrows or beard |
| Usual course | Settles by itself within months | Continues without treatment | Often regrows; needs a doctor’s review |
Two causes at once. A bout of shedding can unmask early pattern thinning, as it did for most women in the dengue series. The 2013 IJDVL review says that shedding which does not settle may actually be early pattern hair loss or a diffuse form of alopecia areata.
The pull test is a doctor’s test
A doctor may gently pull a small bunch of hair to see how many come out easily. How recently you washed your hair changes the result, and the doctor reads it together with your history and scalp examination. Tugging and counting at home adds worry and tells you little, so leave it to the clinic.
What helps while you wait
Time helps most. The IJDVL reviews describe treatment as mainly reassurance, and StatPearls calls acute shedding self-limited.
- Eat enough, with protein in every meal. Appetite is often poor during a fever. Return to regular meals with dal, dahi, paneer, eggs, fish or chicken. DermNet advises a nutritious diet with plenty of protein, fruit and vegetables. Our guide to foods for hair fall shows how to build this into an Indian thali.
- Do not crash diet to get back your old weight or shape; it can start a second round of shedding.
- Treat what a doctor finds. DermNet advises correcting any thyroid problem and low iron, vitamin B12 or folic acid. Our guide to blood tests for hair fall explains which tests help.
- Be gentle with your hair. DermNet suggests avoiding over-vigorous combing and brushing; StatPearls says you can keep washing and styling your hair as usual. Both fit: wash normally, comb gently, and avoid tight plaits, buns or ponytails.
- Sleep and manage stress. The AAD notes that ongoing stress can make shedding last longer.
What does not help, or may mislead
- Hair oils and special shampoos. Oiling can feel good, but we found no trial showing that any oil or shampoo shortens this shedding. The hairs on your comb stopped growing months ago.
- Supplements without a deficiency. The 2013 IJDVL review states there are no proven vitamins or supplements for any form of hair loss, and that biotin has been shown not to affect this kind of shedding. Replacing a measured deficiency, such as low iron, may help.
- Biotin before blood tests. The US Food and Drug Administration (FDA) warns that biotin can make some lab tests read falsely high or low, including hormone tests, and that many hair, skin and nail supplements contain large amounts. Tell your doctor and the lab if you take any.
- Expensive hair-clinic packages. StatPearls notes that hair-growth medicines and hair transplants are unnecessary for this condition. Get a diagnosis before paying for a course of treatment.
If shedding lasts longer than six months
Shedding beyond about six months is no longer typical of a single trigger and deserves a doctor’s review. It may be chronic telogen effluvium, which DermNet says mainly affects healthy women aged 30 to 60 and can come and go for years without causing baldness. The 2009 IJDVL review explains that shedding becomes chronic when its cause persists beyond six months, so an ongoing cause such as low iron, thyroid disease or poor nutrition is worth looking for. A doctor can examine your scalp and decide which tests are worth doing.
When to see a doctor
These are the main warning signs after an illness; our hub has the full list of hair-loss red flags.
Emergency: get help now
- A painful, swollen or pus-filled scalp patch with fever or feeling very unwell.
- Sudden heavy hair loss with vomiting, confusion, or numbness or weakness in the hands or feet.
- Thoughts of harming yourself. Call 112 or Tele Mental Health Assistance and Networking Across States (Tele-MANAS), the Government of India’s mental-health helpline (14416).
Prompt review: within days to a few weeks
- Round bald patches, or patches that are red, scaly, painful or smooth and shiny.
- Sudden heavy shedding with no illness, delivery, diet or other trigger in the past few months.
- Shedding with tiredness, paleness, breathlessness, heavy periods, feeling unusually cold or hot, or weight change.
- Fever that has not fully gone, or weight loss you cannot explain.
- Hair fall after starting a new medicine. Do not stop it; ask the doctor who prescribed it.
- Skipping meals, severe food restriction or fear of eating.
Routine review
- Shedding after an illness or childbirth that has not settled after six months.
- A widening parting or receding hairline that remains after the shedding slows.
- Before starting any iron, zinc, biotin or “hair” supplement, especially if you are pregnant or breastfeeding.
How Disha can help
Disha is an AI health coach that chats and calls in Hindi, English and Hinglish. After an illness it can help you get back to regular meals with enough protein, avoid crash dieting, and keep up sleep and gentle movement while your hair recovers. It does not diagnose hair loss, interpret tests, prescribe supplements or provide emergency care, and it does not replace your doctor. Read how Disha coaching works.
This is not medical advice. This page is general education for adults (18+), not a diagnosis or treatment plan. Hair loss in children needs a doctor’s assessment. Do not start, stop or change any medicine or supplement because of this page. If you are pregnant, breastfeeding, or have a current or past eating disorder, get individual advice before changing how you eat.
Frequently asked questions
Why does hair fall start months after a fever?
A high fever pushes many growing hairs into a resting phase at the same time. They stay in the scalp for a few months, then fall out when new hairs start growing underneath and push them out. That is why shedding usually starts about 2 to 3 months after the fever, often when you have already recovered.
How long does hair fall after dengue last?
In a small Taiwanese study of 14 people, shedding began about two months after dengue and lasted around three months on average. That matches shedding after other fevers, which Indian dermatology reviews expect to stop within 3 to 6 months. Hair usually regains its fullness over the following months. See a doctor if it lasts beyond six months.
Is hair fall after COVID permanent?
Usually not. A 2022 systematic review found that shedding after COVID-19 began about 56 days after the infection on average, and settled within about 1 to 6 months in every patient whose follow-up was reported. If your parting keeps widening after the shedding stops, pattern hair loss may be showing through, and a doctor can check.
Will I go bald from hair fall after typhoid or fever?
No. This kind of shedding can thin hair noticeably, up to about half the scalp hair, but DermNet notes it does not cause complete baldness. Hair usually regains its normal fullness within 6 to 9 months, sometimes up to a year. Round bald patches are a different problem and need a doctor’s review within days to weeks.
Should I take biotin or hair vitamins after an illness?
Not unless a doctor finds a deficiency. An Indian dermatology review states there are no proven vitamins or supplements for any form of hair loss, and that biotin has been shown not to affect this kind of shedding. High-dose biotin can also make some blood tests, including hormone tests, read falsely high or low. Regular meals with enough protein matter more.
Does hair oil stop hair fall after fever?
We found no trial showing that oiling shortens shedding after a fever. The hairs falling now stopped growing months ago, so no oil can hold them in. If you enjoy oiling, carry on, but avoid pulling hair into tight plaits or buns afterwards. Eating well and giving it time help more.
Can a crash diet cause the same kind of hair fall?
Yes. Rapid weight loss, such as losing about 9 kg or more, is a well-known trigger, and an Indian review links shedding to diets very low in protein and energy. It usually starts a few months after the diet and settles once you eat normally again. Lose weight slowly, with protein in every meal.
Sources
- American Academy of Dermatology. Do you have hair loss or hair shedding? Current patient guidance, accessed September 2026. Supports: 50–100 hairs a day as normal; triggers including high fever, recovering from illness, losing 20 pounds or more, childbirth, surgery, stress and stopping the pill; postpartum shedding at about two months, peaking at four; fullness returning within 6 to 9 months; long-lasting shedding with ongoing stress.
- DermNet (updated by Chang F-LC; editor Oakley A). Telogen effluvium. 2019. Supports: 85% growing and 15% resting hairs; up to 70% pushed into resting; shedding 2 to 4 months after the trigger; hair fall as a sign of regrowth; up to 50% of scalp hair affected without complete baldness; tapering over 6–9 months; triggers including fever, surgery, diet, thyroid disease, medicines and stopping the pill; chronic form in women aged 30–60; gentle handling, nutritious diet and correcting thyroid, iron, B12 and folic acid.
- Hughes EC, Syed HA, Saleh D. Telogen Effluvium. StatPearls, updated 2024. Supports: onset range of 1 to 6 months; medicine classes linked to shedding; the pull test as part of examination; self-limited course; washing and styling as usual; hair-growth medicines and transplants unnecessary; full restoration over months to a year.
- Grover C, Khurana A. Telogen effluvium. Indian Journal of Dermatology, Venereology and Leprology, 2013. Review. Supports: onset 2–3 months after the trigger; no trigger found in up to 33%; one-third to one-half of women affected after childbirth; stopping the pill; crash diet described as under 0.8 g/kg protein and 1,200 kcal a day; treatment mainly reassurance, with shedding expected to stop in 3–6 months; no proven vitamins or supplements, biotin not affecting shedding; shedding that does not settle possibly being early pattern hair loss or diffuse alopecia areata.
- Shrivastava SB. Diffuse hair loss in an adult female: Approach to diagnosis and management. Indian Journal of Dermatology, Venereology and Leprology, 2009. Review. Supports: severe febrile illness such as malaria among the commonest triggers; 100–1,000 hairs a day; no trigger in one-third; resolution in 3–6 months with complete recovery possibly taking a year; reassurance and explanation as the basis of management; the pull test and the effect of recent shampooing; shedding becoming chronic when the cause persists beyond six months, with iron deficiency, thyroid disease and malnutrition among accepted causes.
- Ozlu E, Karadag AS. Telogen Effluvium. In: Hair and Scalp Disorders, IntechOpen, 2017. Book chapter. Supports: typhoid, malaria and tuberculosis among febrile triggers; no data defining the level of risk for each trigger.
- Chu CB, Yang CC. Dengue-associated telogen effluvium: A report of 14 patients. Dermatologica Sinica, 2017. Case series. Supports: onset on average 2.1 months after dengue, lasting 2.9 months; 10 of 13 women also having female pattern hair loss.
- Nguyen B, Tosti A. Alopecia in patients with COVID-19: A systematic review and meta-analysis. JAAD International, 2022. Systematic review. Supports: mean onset 56.5 days after COVID-19; resolution in 86 of 86 patients with reported follow-up within about 1 to 6 months.
- Malkud S. A Hospital-based Study to Determine Causes of Diffuse Hair Loss in Women. Journal of Clinical and Diagnostic Research, 2015. Observational study. Supports: telogen effluvium in 64% of 180 Indian women with diffuse hair loss; probable causes including stress, fever, medicines, crash diets and childbirth; no cause found in about a quarter; low haemoglobin in 60% of those tested.
- US Food and Drug Administration, republished by the American Society of Anesthesiologists. Biotin (Vitamin B7): Safety Communication – May Interfere with Lab Tests. 2017. Supports: falsely high or low results on hormone and other tests; high biotin levels in hair, skin and nail supplements.
Related reads
- Hair loss in India: causes, tests, treatment and daily care: the full overview of every type of hair loss and its treatment; this page goes deeper on shedding after illness only.
- Foods for hair fall: iron, protein and the Indian thali: what to eat while you recover, with a hair-friendly thali and an example day.
- Blood tests for hair fall: which ones help and which are overused: haemoglobin, ferritin, thyroid and vitamin tests explained.
- All hair loss articles: every Disha guide on hair fall and thinning.
- Calorie counter for Indian household servings: check you are eating enough while you recover from an illness; values are estimates.
