Telogen effluvium is temporary hair thinning over the scalp that occurs because of changes in the growth cycle of hair.Trichotillomania, seen most frequently in children, is a psychological disorder in which a person pulls out one's own hair.Alopecia universalis causes all body hair to fall out, including the eyebrows, eyelashes, and pubic hair.But in about 90% of people with the condition, the hair returns within a few years. This condition may result in complete baldness (alopecia totalis). Alopecia areata often starts suddenly and causes patchy hair loss in children and young adults.Women experience a general thinning over the entire scalp, with the most extensive hair loss at the crown. Women with this condition, called female pattern baldness, don't experience noticeable thinning until their 40s or later. It's characterized by a receding hairline and gradual disappearance of hair from the crown and frontal scalp. Men with this condition, called male pattern baldness, can begin suffering hair loss as early as their teens or early 20s. Androgenic alopecia is a genetic condition that can affect both men and women.More hair follicles go into the resting phase, and the remaining hairs become shorter and fewer in number. 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 two to three 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 two to three weeks.Anagen - active hair growth that generally lasts between two to eight 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 one 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 six inches a year. Hair is made up 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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