Hormone deficiencies occur when the body does not produce enough of a certain hormone. Some common hormone deficiencies include: Thyroid hormone deficiency The thyroid gland regulates many important body functions. Hypothyroidism, or an underactive thyroid, happens when the thyroid gland does not produce enough thyroid hormones. Symptoms can include fatigue, weight gain, feeling cold, dry skin, hair loss, and depression. Hypothyroidism is usually treated with synthetic thyroid medication. Growth hormone deficiency Growth hormone is essential for growth and cell production. Growth hormone deficiency in children can lead to slowed growth. In adults, it causes increased body fat, decreased muscle mass, tiredness, and other issues. It is treated with growth hormone injections. Testosterone deficiency Low testosterone, or hypogonadism, occurs when the testes do not produce enough testosterone. Symptoms include erectile dysfunction, reduced sex drive, decreased energy, and more body fat. It can be treated with testosterone replacement given as injections, gels, or pellets placed under the skin. Estrogen deficiency Estrogens are a group of hormones that promote female sex characteristics. The reduction of estrogen production causes menopausal symptoms like hot flashes, vaginal dryness, and emotional changes. Estrogen deficiency can increase a woman's risk of developing osteoporosis and heart disease. Hormone therapy medications can help supply the body with adequate estrogen. In summary, hormone deficiencies happen when glands in the body do not produce adequate amounts of hormones that regulate essential bodily processes. Symptoms vary depending on the specific hormone. Treatment typically involves medications or injections to replace the deficient hormone. Visit Balance Hormone Center for more information on hormone deficiencies and treatment options.