Every hair on your head goes through a three-part life cycle of growing, resting and shedding. In that last phase, an old hair is pushed out by a new one sprouting underneath. So technically it’s falling out, but it’s not considered hair loss because there’s already a replacement coming in. Your individual hairs are all at different points in the cycle, so they’ll never all be in the shedding stage at once—that’s why you don’t periodically go bald!
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