Hair loss after dengue fever: what to expect

Dengue fever is a familiar illness in Malaysia. Many people who have had it are surprised when, weeks after they feel better, their hair starts coming out in handfuls. This delayed hair fall is common after high fevers, and in most cases it settles with time.

Why dengue can cause hair fall

Dengue usually causes a high temperature, a severe headache, pain behind the eyes, muscle and joint pain, nausea and a rash ¹. A high fever and a serious illness put the body under strain. In response, many hair follicles can switch from the growth phase to the resting phase at the same time.

Those resting hairs stay in place for a while, then shed together when new hairs push them out. This is called telogen effluvium. DermNet lists illness, especially with fever, among its typical triggers, and notes that increased hair fall is usually noticed two to four months after the triggering event ².

Doctors have published case reports of acute telogen effluvium after dengue. In one, the shedding after dengue looked similar to pattern hair loss (androgenetic alopecia), which shows why a proper assessment can be helpful ³.

What to expect

• Timing: hair fall usually begins about two to four months after the fever, often when you have otherwise recovered
• Pattern: shedding across the whole scalp, with hair coming out in the shower, on the pillow and in your brush. Sometimes it is more obvious at the top or the temples
• The hairs: shed hairs often have a small white bulb at the root. This is a normal resting hair
• Duration: shedding reaches a peak, then gradually tapers back to normal, in most cases over about six to nine months ²

Paradoxically, the shedding is partly a sign that new hairs are growing, because they push the old resting hairs out. A fringe of short new hairs along the hairline is often the first sign of recovery.

What helps recovery

There is no treatment that stops telogen effluvium once it has started. Recovery depends mostly on time, but these steps support your body:

• Eat well after the illness. Appetite often drops during dengue. Getting back to regular, balanced meals with enough protein, fruit and vegetables supports recovery ⁴
• Check for low iron if you also feel very tired or breathless, or if you have heavy periods. See anaemia and hair loss
• Be gentle with your hair. Use a mild shampoo, avoid tight ponytails and buns, and limit heat and chemical treatments while shedding is heavy ⁵
• Keep washing your hair as usual. Washing only removes hairs that were already going to fall
• Avoid expensive quick-fix treatments. Products that promise to end the shedding quickly have little evidence. Unless a blood test shows a deficiency, supplements are not proven to speed recovery

During the dengue illness itself

Hair is not the priority while you are ill. The NHS advises rest, plenty of fluids and paracetamol for fever and pain, and warns against anti-inflammatory painkillers such as ibuprofen or aspirin, because they can cause bleeding problems in dengue ¹. Warning signs of severe dengue, such as severe tummy pain, repeated vomiting, bleeding gums or nose, fast breathing, extreme tiredness or blood in vomit or stool, need emergency care ¹.

Could it be something else?

Telogen effluvium after dengue is the most likely explanation if hair fall starts a few months after the illness. But consider other causes if:

• Shedding continues beyond six to nine months
• You notice a gradually widening parting or receding hairline, which may suggest pattern hair loss that the shedding has made more noticeable. See a widening part or receding hairline
• There are bald patches, or the scalp is itchy, red or scaly
• You have had several illnesses or stresses close together, which can make shedding last longer

When to see a doctor

See a GP or dermatologist if:

• Hair fall is still heavy six months after the dengue
• You see bald patches or scalp changes
• You feel unusually tired, dizzy or unwell
• The hair loss is causing you significant distress

A doctor may examine your scalp and may suggest blood tests, such as iron levels, a full blood count or thyroid function ⁶. See a calm first response to hair loss.

The bottom line

Hair fall after dengue is common and usually temporary. It is a reaction to the fever and illness, starting two to four months later and gradually settling over several months. Eat well, treat your hair gently and give it time. See a doctor if it lasts longer than six months, or if there are bald patches or other symptoms. Similar shedding can follow other fevers too, including COVID-19.

Frequently asked questions

Can dengue cause hair loss?

Yes. The high fever and illness can trigger telogen effluvium, a temporary shedding that usually starts two to four months later ^{2 3}.

How long does hair fall after dengue last?

It usually peaks and then tapers back to normal over about six to nine months ².

Will my hair grow back after dengue?

In most cases, yes. A fringe of short new hairs along the hairline is often the first sign of recovery ².

What should I avoid during dengue?

The NHS advises against ibuprofen and aspirin because of bleeding risk, and recommends rest, fluids and paracetamol ¹.

Educational content. Not medical advice.