![]() ![]() Involutional alopecia is a natural condition in which the hair gradually thins with age.There are many types of hair loss, also called alopecia: Telogen: resting phase that lasts about 2 to 3 months at the end of the resting phase the hair is shed and a new hair replaces it, and the growing cycle starts again.Īs people age, their rate of hair growth slows. ![]() Catagen: transitional hair growth that lasts 2 to 3 weeks.Anagen: active hair growth that generally lasts between 2 to 8 years.This life cycle is divided into three phases: ![]() Each follicle has its own life cycle that can be influenced by age, disease, and a wide variety of other factors. The average adult head has about 100,000 to 150,000 hairs and loses up to 100 of them a day finding a few stray hairs on your hairbrush is not necessarily cause for alarm.Īt any time, about 90% of the hair on a person's scalp is growing. The hair you can see is actually a string of dead keratin cells. ![]() As follicles produce new hair cells, old cells are being pushed out through the surface of the skin at the rate of about 6 inches a year. Hair is made of a protein called keratin that is produced in hair follicles in the outer layer of skin. Hair grows everywhere on the human skin except on places like the palms of our hands and the soles of our feet, our eyelids and belly buttons, but many hairs are so fine they're virtually invisible. ![]()
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