Progressive hair loss, also called chronic hair loss, has genetic and hormonal causes. It happens slowly, with hair getting gradually finer and less dense over the years, usually in specific areas.
Reactive hair loss can happen in response to a specific event, such as stress, illness, childbirth, a nutritional deficiency, certain medications, or a change of season. It tends to come on suddenly and all over the head, but hair usually grows back once the cause has passed.
When in doubt, consult your healthcare professional.
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