Cause of Female Hair 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.
It is normal to shed some hair each day as part of this cycle. However, some people may experience excessive (more than normal) hair loss.
Hair loss can be sudden or gradual loss or thinning of hair on your head or on other parts of your body. A gradual loss or thinning of hair without any accompanying symptoms is common. However hair loss that is accompanied by general ill health requires your doctor's attention.
The most common causes of hair loss in women are not related to inherited genes, but to temporary metabolic problems associated with pregnancy, unusual stress, chemotherapy, crash diets/anorexia, thyroid hormone deficiency, major surgery, severe infection or high fever. Certain drugs can also take their toll on once lush and healthy tresses. However, these conditions are usually temporary, and once the ¡°trauma¡± is alleviated, the hair shedding stops and healthy regrowth occurs with time.
A number of things can cause excessive hair loss. For example, about 3 or 4 months after an illness or a major surgery, you may suddenly lose a large amount of hair. This hair loss is related to the stress of the illness and is temporary.
Hormonal problems may cause hair loss. If your thyroid gland is overactive or underactive, your hair may fall out. This hair loss usually can be helped by treatment of the thyroid disease. Hair loss may occur if male or female hormones, known as androgens and estrogens, are out of balance. Correcting the hormone imbalance may stop your hair loss.
Many women notice hair loss about 3 months after they've had a baby. This loss is also related to hormones. During pregnancy, high levels of certain hormones cause the body to keep hair that would normally fall out. When the hormones return to pre-pregnancy levels, that hair falls out and the normal cycle of growth and loss starts again.
Some medicines can cause hair loss. This type of hair loss improves when you stop taking the medicine. Medicines that can cause hair loss include blood thinners (also called anticoagulants), medicines used for gout, medicines used in chemotherapy to treat cancer, vitamin A (if too much is taken), birth control pills and antidepressants.
Certain infections can cause hair loss. Children may have hair loss caused by a fungal infection of the scalp. The infection is easily treated with antifungal medicines.
Finally, hair loss may occur as part of an underlying disease, such as lupus or diabetes. Since hair loss may be an early sign of a disease, it is important to find the cause so that it can be treated.
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