What is the normal cycle of hair growth and loss?
– At any one time, about 10 percent of the hair on your scalp is in a resting phase. After 2 to 3 months, the resting hair falls out and new hair starts to grow in its place. This growing phase lasts for 2 to 6 years. Each hair grows approximately 1 centimeter per month during this phase. About 90 percent of the hair on your scalp is growing at any one time. Causes About 90 percent of the hair on most people’s scalps is in a two to six year growth (anagen) stage at any given time. The other 10 percent is in a two to three month resting (telogen) phase, after which time it is shed. Most people shed 50 to 150 hairs a day. Once a hair is shed, the growth stage begins again as a new hair from the same follicle replaces the shed hair. New hair grows at a rate of approximately one half inch each month. What causes alopecia areata – Alopecia areata is classified as an autoimmune disease, but the cause is unknown. People who develop this type of baldness are generally in good health. Some scie
