Why it can happen
Hair thinning may be hereditary, while increased shedding can follow illness, childbirth, stress or significant weight loss. Hormonal changes, thyroid conditions, iron deficiency, some medicines and restrictive eating can also contribute. Scalp inflammation and tension from tight hairstyles are other possibilities. More than one factor may be involved, and shedding can begin months after a trigger, making a careful history especially useful.
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