Hair loss is typically considered the domain of aging men, but this equal-opportunity condition – which has many causes – can affect virtually anyone. Shedding hair is different from hair loss, when a hair falls out and doesn't grow back. "So it feels like a hair loss, but it's not a hair loss." An autoimmune condition called alopecia areata, which has no cure, causes rapid body-wide hair loss. Medications and vitamins: Cancer chemotherapy, which attacks hair follicles in its attempt to kill all fast-growing cells around the body, is a well-known reason for hair loss.

Source: Fox News January 26, 2020 10:02 UTC