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  2. Hair loss - Wikipedia

    en.wikipedia.org/wiki/Hair_loss

    Common types include male- or female-pattern hair loss, alopecia areata, and a thinning of hair known as telogen effluvium. [4] The cause of male-pattern hair loss is a combination of genetics and male hormones; the cause of female pattern hair loss is unclear; the cause of alopecia areata is autoimmune; and the cause of telogen effluvium is ...