Male Pattern Baldness
Androgenetic alopecia (also known as male pattern baldness) occurs in both men and women. Balding usually starts at any age after puberty and can range from partial loss to complete baldness. It is a permanent hair loss condition that can not be prevented. It can be caused by both hormonal (androgens) and genetic factors (heredity).
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Hair loss usually begins at the temples and the top of the head toward the back, causing a receding hairline and a bald spot. In some circumstances, hair loss may continue until the two sections become joined, which causes the top crown to be completely bald. It usually progresses slowly and is not associated with redness, itching, or pain.
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Contrary to the popular myth, balding is not caused by wearing hats. Massaging or brushing the scalp will not help regrow hair, and excessive cleaning of the scalp will not "unclog" follicles and allow hair growth. Normal or excessive everyday stress does not contribute to balding and is not a cause of androgenetic alopecia.
Hyperthyroidism and Hypothyroidism
The thyroid gland is a bilobed structure surrounding the trachea. It produces thyroxine, which regulates cell metabolism in humans as well as all mammals. Malfunction of the thyroid gland can lead to a condition called a goiter. Hyperthyroid goiter tells the thyroid to produce an excessive amount of thyroxine, making it overactive. Hypothyroid goiter depresses the amount of thyroxine produced by the thyroid.
Both conditions affect the bodies metabolism. Medications are taken to help regulate the body's production of thyroxine also affect a human being's hair, nails, and skin. Some people that suffer from either of these conditioned are usually having some form of hair loss.
Telogen effluvium: (usually temporary hair loss) Caused by Physical stress, emotional stress, thyroid abnormalities, medications and hormonal causes normally associated with females.
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Anagen effiuvium: Generally due to internally administered medications, such as chemotherapy agents, that poison the growing hair follicle.
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