Low iron levels: Iron deficiency, with or without anemia, can lead to hair loss. Do not simply start taking an iron supplement without having your iron checked by a physician because too much iron can also lead to health problems.
Thyroid disorders: Both an overactive and an underactive thyroid can lead to hair loss.
Low estrogen levels: Many women experience hair loss during and after menopause, when estrogen levels begin to drop. Other hormonal changes -- changes in oral contraceptive use, for example -- can also trigger hair loss.
Post-pregnancy hormonal changes: Similarly, new moms may find that they're shedding a lot of hair in the first one to six months after delivery, when their estrogen levels return to normal. Actually, what seems like excessive hair loss is really hair's natural growth cycle regulating itself, as high hormone levels tend to keep women from losing normal amounts of hair during pregnancy.
Telogen effluvium: This is the general term for sudden, temporary hair loss as a result of recent stress or surgery, which typically occurs around two months after the causative event or illness. (It may also be used to describe sudden hair loss as a result of other factors on this list, such as post-pregnancy hormonal changes.)
Medications: Many medications may lead to hair loss. If this is a concern, talk to your doctor about potential alternatives
High levels of vitamin A or selenium: There is rarely any reason to take more of these nutrients than you'd find in a good multivitamin.
www.health.yahoo.com
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