Can the flu trigger hair loss?

Question

Hello doctor,

I recently had a really bad case of the flu and was bedridden for almost a week. Since then, I’ve noticed more hair falling out than usual when I shower or brush my hair. I am a 38-year-old woman, and this sudden hair shedding is freaking me out. Could the flu have triggered this? Or is it a sign of something else, like thyroid or anemia? My periods have also been a bit irregular lately. I am worried I might be losing too much hair. Should I see a dermatologist or get some blood tests done?

Kindly help.

Answer 1

Hello,

Welcome to icliniq.com.

I read your query and can understand your concern.

What you are describing sounds like a condition called telogen effluvium, which is a common form of temporary hair shedding triggered by physical stress on the body, such as a severe illness, high fever, or emotional stress. It often appears 6–12 weeks after the event, and in your case, a serious bout of the flu could very well be the trigger.

However, other causes like thyroid imbalances, iron deficiency/anemia, or hormonal shifts (especially around perimenopause) can also lead to similar hair shedding, especially when paired with irregular periods.

Here is what you should consider doing:

Blood tests: Ask your doctor for a workup, including:
Thyroid function tests.
Ferritin (iron stores).
CBC (complete blood count to check for anemia).
Vitamin D and B12 levels.
Hormone panel if menstrual irregularities persist.
Dermatologist referral: If shedding continues beyond 3 months or worsens, a dermatologist can examine your scalp, check for pattern hair loss, and possibly perform a pull test or scalp biopsy if needed.

The good news is that telogen effluvium is typically reversible. Hair usually starts to regrow once the body recovers from the stressor and nutrient levels are corrected. Recovery can take a few months, so be patient and gentle with your hair in the meantime (avoid heat styling, harsh brushing, or tight hairstyles).

I hope this information helps you.

Feel free to ask further queries.

Thank you.