The American Thyroid Association has released new, revised Management Guidelines for the diagnosis and treatment of patients with thyroid nodules and thyroid cancer. The new guidelines are published in Thyroid, a peer-reviewed journal published by Mary Ann Liebert, Inc. Thyroid is the official journal of the American Thyroid Association (ATA). The ATA's revised Management Guidelines and accompanying editorials are available free online at

Melatonin, a natural hormone segregated by the own human body, is an excellent sleep regulator expected to replace somniferous, which are much more aggressive, to correct the sleep/wakefulness pace when human biological clock becomes altered.

Graves' disease is an autoimmune disease in which the patient's own immune system attacks the thyroid gland, causing it to produce too much thyroxine. Thyroxine (T4) is a hormone produced by the thyroid gland that has four iodine molecules attached to its molecular structure. T4, as well as other thyroid hormones help regulate growth and control metabolism in the body. Graves' disease is a form of hyperthyroidism.

The hormones, called androgens, are important in the development of masculine characteristics such as aggression and strength. It is also thought that prenatal androgens affect finger length during development in the womb. High levels of androgens, such as testosterone, increase the length of the fourth finger in comparison to the second finger.

For estrogen replacement to provide stroke protection, it likely must be given soon after levels drop because of menopause or surgical removal of the ovaries, scientists report in the Journal of Neuroscience.