Friday, January 22, 2010
Hair loss is really somewhat common. According to the American Academy of Dermatology, nearly half of all adults in the U.S. will experience reduction hair by age 40. But thyroid patients in particular may experience hair loss before and more quickly than usual.
Normally, hair grows about a half inch a month for about three years, and then it goes into a resting period. One in ten hairs are in a resting period at any one time, and after about three months a new hair pushes the old one out. When more hairs go into resting period, or the conversion process speeds up, the balance becomes disrupt, and hair loss occurs.
Hormonally induced hair loss takes place when an enzyme starts to convert the hormone testosterone on the scalp to its less useful edition, dihydrotestosterone, or DHT. DHT then attacks the hair follicle, and shrinks it, even making it vanish completely. Hair becomes thinner and finer, and may stop growing entirely. This conversion of testosterone to DHT seems to be sped up in some patients with hyperthyroidism or hypothyroidism, and may be the cause of hair loss that continues for thyroid patients, despite what is considered sufficient thyroid treatment.
Some people actually complain that rapid hair loss is the most horrible symptom of their thyroid problem - the thinning hair, large amounts of hair falling out in the shower or sink, often accompanied by changes in the hair's texture, making it dry, crude, or easily twisted. Interestingly, some people have actually written to tell me that their thyroid problem was initially "diagnose" by a hairdresser, who notice the change in their hair!
While thyroid disease frequently causes common hair loss from the hair on the head, a unique and typical symptom of hypothyroidism is loss of the hair on the outer edge of the eyebrows. General loss of body hair from areas other than the head can also be seen in thyroid disease.
posted by Excitingspas
@ 1:26 AM
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