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Perhaps the most well-known condition to cause hair loss is alopecia, which, Massick explains, “causes your own immune system to attack the hair follicles [so that] the hairs just fall out ...
But in some cases, external factors — like stress — can affect hair, causing everything from thinning hair and a wider part, to a receding hairline, hair falling out in clumps or even patches ...
At the end of the resting phase, the hair falls out (exogen) and a new hair starts growing in the follicle, beginning the cycle again. Normally, about 40 (0–78 in men) hairs reach the end of their resting phase each day and fall out. [28] When more than 100 hairs fall out per day, clinical hair loss (telogen effluvium) may occur.
Hair can regrow, but it may fall out again, either in the same places or new places. Telogen effluvium (TE). This type of hair loss can cause hair shedding. You might notice more hair than usual ...
When the body is subjected to extreme stress, as much as 70 percent of hair can prematurely enter the telogen phase and begin to fall, causing a noticeable loss of hair. This condition is called telogen effluvium. [20] The club hair is the final product of a hair follicle in the telogen stage, and is a dead, fully keratinized hair. [11]
Radiation induces hair loss through damage to hair follicle stem cell progenitors and alteration of keratin expression. [72] [73] Radiation therapy has been associated with increased mucin production in hair follicles. [74] Studies have suggested electromagnetic radiation as a therapeutic growth stimulant in alopecia. [75]