Hair fall after fever, childbirth or crash dieting

Hair grows in cycles. A significant physical stress — high fever, surgery, childbirth, a crash diet, severe illness — can push a large proportion of growing hairs into the resting phase at once. Those hairs are shed when the next cycle begins, typically two to three months later.

This delay is why patients often do not connect the two events, and why the question at a consultation is always about what happened in the months before the shedding started, not the week before.

Telogen effluvium is diffuse. Hair comes out across the scalp rather than in patches, it is noticeable on the pillow, in the shower drain and on the comb, and the ponytail feels thinner. Patchy loss, scaling, itching or scarring points to something else and needs examination.

Importantly, follicles are not lost in this process. Density recovers as the cycle normalises, usually over several months.

Blood tests are advised when the history or examination suggests they will change treatment — commonly iron stores, thyroid function and vitamin D. Iron deficiency is common in Indian women and is frequently the difference between recovery and continued shedding.

What is rarely useful is a panel of tests ordered without examination, or supplements taken without knowing whether a deficiency exists in the first place.

Two processes often coexist. Someone with early pattern hair loss who then has a fever or delivers a baby may have both, and when the effluvium settles, the underlying pattern loss becomes more visible. This is why an examination matters rather than waiting it out indefinitely.

As a rule, shedding that continues beyond six months, a visibly widening parting, or thinning at the crown deserves assessment rather than patience.