A goiter is a swelling of the thyroid gland in your neck. In parts of Africa, Asia and South America, the goiter is often caused by a lack of iodine. However, the use of iodized table salt has reduced iodine deficiency in the United States, according to the University of Maryland Medical Center.

The term "estrogen" actually describes several different related hormones. These estrogens are estrone (predominant form during menopause), estriol (primary estrogen during pregnancy), and estradiol (which is the most common form of estrogen in non-pregnant women between puberty and menopause).

During pregnancy, circulating levels of the sex hormones estrogen and progesterone rise to prepare your body for lactation. After you give birth, however, levels of these hormones drop as your body increases production of prolactin.

Progesterone is a steroid hormone that plays a role in maintaining the female menstrual cycle, pregnancy and human development. Progesterone is produced in the ovaries, adrenal glands and placenta. During the menstrual cycle, estrogen stimulates growth of the endometrium, which is the inner lining of the uterus.

Teenage years are a stressful time as your body goes through a number of changes. The hormones your body begins to produce allow you to procreate, but they also change your appearance and behavior.

Progesterone is a hormone that is usually associated with females. However, it is essential in both sexes. In men it is mainly produced by the testes and is required for such vital bodily functions as development of bone density and regulating blood sugar levels. In men, progesterone is converted to testosterone.

The thyroid is a gland in your neck that produces hormones important for a healthy metabolism, energy levels, body temperature and moods. If you have hypothyroidism, your thyroid produces too few hormones, causing lethargy, weight gain and depressive moods.

Estrogen dominance is a health disorder with an increasing significance in recent years due to the synthetic estrogens found in a variety of products, such as pesticides, plastics and hormone-injected meats and dairy.

Steroids, also known as glucocorticoids, are medicines related to the human hormone cortisol.

The body can normally manufacture the biochemical carnitine; L-carnitine, one of two types, is present in beef, chicken, fish, dairy products, grains and legumes and is available in supplement form.

Progesterone is a hormone secreted by a woman’s ovaries that helps to regulate ovulation and menstrual bleeding. This important hormone has also been used as a supplement to treat many symptoms of menopause.

Hypothyroidism or myxedema is also referred to as having an underactive thyroid. Your thyroid is an important organ in the body and is responsible for your metabolism and other important functions. One of the signs of an underactive thyroid can be hunger.