We have studied the levels of DHT in people with androgenetic alopecia and usually normal. Therefore, science has determined that there is a high level of DHT which causes hair loss but a particular sensitivity of the follicles against DHT. What causes excessive hair loss? A number of things can cause excessive hair loss. For example, about three or four months after an illness or major surgery, you may suddenly lose a large amount of hair. This hair loss is related to the stress of and is temporary. Hormonal problems may cause hair loss.
If your thyroid gland is overactive, or are less active than your hair may fall out. This hair loss usually can be helped with treatment of the thyroid. Hair loss may occur if there is a balance of male or female hormones known as androgens and estrogens. Correcting the hormone imbalance may stop your hair loss. Many women notice hair loss about three months of having 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.
When the hormones return to levels prior to pregnancy, that hair falls out and the normal cycle of growth and loss starts again. Some cause hair loss. This type of hair loss improves when you stop taking it. Drugs that can cause hair loss include those for “blood thinners (also called anticoagulants), medicines used to treat gout, chemotherapy to treat cancer, vitamin A if taken in excess, pills for birth control and antidepressants.