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Hair Fall After Dengue: Why It Happens and When It Stops

Malaysia lives with dengue every year. Weeks after the fever is gone, many people see hair in the shower drain, on the pillow, and in the comb, and they fear they are going bald. The medical name for this shedding is telogen effluvium. The papers below explain why it starts late, what a dengue hospital record found, and what to check.

Why hair falls months after the fever

Kligman first described telogen effluvium in 1961, and Malkud's review calls it the most common cause of diffuse hair loss. On a normal scalp, 90 to 95 percent of follicles are growing (anagen) and 5 to 10 percent are resting (telogen), and 100 to 150 hairs are shed each day. A strong trigger pushes a large group of growing follicles into the resting phase at the same time. Those hairs stay in place for the resting period and then fall together, about 2 to 3 months after the trigger.

The review lists severe febrile illness among the triggers and describes the fever pattern as immediate anagen release: during fever, cytokines start cell death in follicle keratinocytes, and the follicle moves through catagen into telogen. The shedding is diffuse, without scarring or inflammation, and is usually less than half of the scalp hair. Telogen effluvium is described as self-limiting, lasting about 6 months, with new hair growing in over 3 to 6 months once the trigger is not repeated.

What a dengue hospital record found

Gai and colleagues reviewed 1,302 dengue patients at a tertiary hospital in Guangdong between September and December 2024. Fifteen had hair loss, an incidence of about 1.15 percent. Of those 15, 93.33 percent were women. The hair loss most often began in the convalescent phase, after the acute illness, and telogen effluvium was the most common type. Platelet count and hematocrit were significantly lower in the patients with hair loss than in the dengue patients without it.

So if your hair started falling a month or two after dengue, the timing matches the records. A low platelet count during the illness is part of the same picture in that hospital group.

The virus also reaches follicle cells

During Taiwan's 2014 and 2015 dengue epidemics, Wei, Huang, and Chang saw an unusually high rate of scalp hair shedding in infected people. In the laboratory they infected human hair follicle dermal papilla cells, the cells that steer follicle growth and cycling, with dengue virus. The infected cells produced the inflammatory signals IL-6 and TNF-alpha, lost viability, and switched on caspase cell-death signalling. This is a cell-culture study, not a human trial, and it shows a second route from dengue to hair fall: direct inflammation in the follicle, on top of the fever itself.

What to check, and when to see a doctor

Malkud's review gives a simple pull test: grasp 40 to 60 hairs and pull slowly. Normally only 2 or 3 come out; in active shedding more than 10 percent come away. When the cause is not clear, the review's minimum tests are a complete blood count, urine analysis, serum ferritin, and thyroid tests (T3, T4, TSH), because iron deficiency and thyroid disease are the two common hidden partners of this kind of hair loss. In one study of 100 people with diffuse hair loss cited in the review, fever was the cause in 33 percent, psychological stress in 30 percent, and systemic illness in 23 percent.

Shedding that continues past six months is called chronic telogen effluvium. See a doctor if shedding lasts that long, if you see bald patches, redness, or scarring, or if your hair is thinning in a pattern at the crown or temples, because that points to androgenetic alopecia rather than a post-fever shed.

Where Folli-Activ fits

Folli-Activ is not a dengue treatment, and it was not the product in any of these studies. It is a 10-in-1 oral formula for the regrowth months that follow a shed. It brings biotin, the cofactor behind hair keratin work, curcumin paired with piperine for the inflammatory signals discussed in our curcumin note, plus saw palmetto, pumpkin seed oil, nettle root, EGCG, reishi, royal jelly, and aloe vera.

Each bottle holds 90 capsules. On this site, 1 bottle is RM169, 3 bottles are RM447, and 6 bottles are RM699 with free shipping. Go to the cart to see your total with delivery.

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