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Alopecia is hair loss that can be caused by heredity, aging, disease, medications or lifestyle. The timing and course of hair loss can provide clues to its cause.For example, hair loss that comes on suddenly may be attributed to illness, diet, or medical treatments, such as chemotherapy or radiation.nother cause of hair loss is a condition called cicatricial alopecia, in which the hair follicles that produce hair are destroyed. Hair loss can be experienced by people with certain types of anemia, anorexia, and thyroid disease.
Most people have about 100,000 hairs on their heads and lose around 100 to 125 hairs per day (imagine trying to count each one). Alopecia, the medical term for normal hair loss, occurs because scalp hair grows in cycles. Each hair follicle undergoes a growth stage that lasts two to eight years, followed by a two-month resting stage where no growth occurs. Then, the hair strand falls out and a new one begins to grow in its place.