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Hair Cycle |
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The normal cycle of hair growth
lasts for 2 to 6 years. Each hair grows approximately less
half an inch per month during this phase. About 90 percent
of the hair in the scalp is growing at any one time. About
10 percent of the hair in the scalp, at any one time, is in
a resting phase. After 2 to 3 months, the resting hair falls
out and new hair starts to grow in its place. 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 of this type can affect men, women and
children. |
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What
Causes Hair Loss? |
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Hormonal problems may cause
hair loss. If your thyroid gland is overactive or under
active, your hair may fall out. This hair loss usually can
be helped by treatment 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. |
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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.
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. |
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