Hair falling out after stress

A big shock to the system — illness, surgery, a bereavement, a crash diet, severe stress at work — and around three months later your hair starts falling out. Not in patches, just everywhere at once. It looks terrifying, but for most people it’s temporary.

Why it happens

Stress pushes a large number of hair follicles into their resting phase at the same time. Around three months later, those hairs fall out together. Doctors call it telogen effluvium. The gap between the trigger and the shedding is why it confuses everyone — by the time your hair falls out, the stressful event feels like old news. The same mechanism causes postpartum shedding.

What’s normal

Shedding all over the head, not in patches. More hair in the shower, on the pillow, in your hands when you run them through. It can feel like a lot, but there are no bald spots. The shedding phase usually lasts three to six months, and hair can take many months to return to its normal volume.

When to see someone

If it’s still going after six months, that counts as chronic telogen effluvium and is worth investigating. See someone if you see bald patches rather than general thinning, or if your scalp is sore or flaky. Also worth asking whether iron and thyroid checks make sense, because shedding can come back if an underlying cause like iron deficiency isn’t treated. In about one in three cases no clear trigger is found. If the thinning is concentrated at the crown and parting, it may be something else.

Why tracking matters

The worst part of stress shedding is not knowing whether it’s slowing down. You can’t tell from the shower drain because some days are worse than others. One photo of your parting a month, same light, same angle, shows you the trend. If yours doesn’t settle, the photos give your GP something concrete to work with.