Medical Encyclopedia

 

Medical Encyclopedia

Other encyclopedia topics:  A-Ag  Ah-Ap  Aq-Az  B-Bk  Bl-Bz  C-Cg  Ch-Co  Cp-Cz  D-Di  Dj-Dz  E-Ep  Eq-Ez  F  G  H-Hf  Hg-Hz  I-In  Io-Iz  J  K  L-Ln  Lo-Lz  M-Mf  Mg-Mz  N  O  P-Pl  Pm-Pz  Q  R  S-Sh  Si-Sp  Sq-Sz  T-Tn  To-Tz  U  V  W  X  Y  Z  0-9 

Hypogonadism

Contents of this page:

Alternative Names   

Gonadal deficiency

Definition    Return to top

Hypogonadism is when the sex glands produce little or no hormones. In men, these glands (gonads) are the testes; in women, they are the ovaries.

Causes    Return to top

The cause of hypogonadism may be "primary" or "central." In primary hypogonadism, the ovaries or testes themselves do not function properly. Some causes of primary hypogonadism include:

The most common genetic disorders that cause primary hypogonadism are Turner syndrome (in women) and Klinefelter syndrome (in men).

In central hypogonadism, the centers in the brain that control the gonads (hypothalamus and pituitary) do not function properly. Some causes of central hypogonadism include:

A genetic cause of central hypogonadism that also produces an inability to smell is Kallmann syndrome (males). The most common tumors affecting the pituitary area are craniopharyngioma (in children) and prolactinoma (in adults).

Symptoms    Return to top

In girls, hypogonadism during childhood will result in lack of menstruation and breast development and short height. If hypogonadism occurs after puberty, symptoms include loss of menstruation, low libido, hot flashes, and loss of body hair.

In boys, hypogonadism in childhood results in lack of muscle and beard development and growth problems. In men the usual complaints are sexual dysfunction, decreased beard and body hair, breast enlargement, and muscle loss.

If a brain tumor is present (central hypogonadism) there may be headaches or visual loss, or symptoms of other hormonal deficiencies (such as hypothyroidism). In the case of the most common pituitary tumor, prolactinoma, there may be a milky breast discharge. People with anorexia nervosa (excessive dieting to the point of starvation) and those who undergo rapid, extreme weight loss, as seen after gastric bypass surgery, also may have central hypogonadism.

Exams and Tests    Return to top

Tests may be done that check estrogen level (women) and testosterone level (men) as well as FSH level and LH level, the pituitary hormones that stimulate the gonads. Other tests may include a thyroid level; sperm count; prolactin level (milk hormone); blood tests for anemia, chemistries, and iron; and genetic analysis.

Sometimes imaging is necessary, such as a sonogram of the ovaries. If pituitary disease is suspected, an MRI or CT scan of the brain may be done.

Treatment    Return to top

Hormone-based medicines are available for men and women. Estrogen comes in the form of a patch or pill. Testosterone can be given by using a patch, a product soaked in by the gums, a gel, or by injection.

For women who have not had their uterus removed, combination treatment with estrogen and progesterone is often recommended to decrease the chances of developing endometrial cancer. In addition, low dose testosterone can be added for women with hypogonadism who have a low sex drive.

In some women, injections or pills can be used to stimulated ovulation. Injections of pituitary hormone may be used to help male patients produce sperm. In others, surgery and radiation therapy may be needed.

Outlook (Prognosis)    Return to top

Many forms of hypogonadism are potentially treatable and have a good prognosis.

Possible Complications    Return to top

In women, hypogonadism may cause infertility. Menopause is a form of hypogonadism that occurs naturally and can cause hot flashes, vaginal dryness, and irritability as a woman's estrogen levels fall. The risk of osteoporosis and heart disease increase after menopause.

Some women with hypogonadism opt to take estrogen therapy, particularly those who have early menopause (premature ovarian failure). However, there is a small but significant increase in risk for breast cancer and possibly heart disease with use of hormone therapy for treatment of menopause symptoms.

In men, hypogonadism results in loss of sex drive and may cause weakness, impotence, infertility, and osteoporosis. Men normally experience some decline in testosterone as they age, but it is not as dramatic or steep as the decline in sex hormones experienced by women.

When to Contact a Medical Professional    Return to top

Consult with your doctor if you notice loss of menstruation, breast discharge, problems getting pregnant, hot flashes (women), impotence, loss of body hair, weakness, breast enlargement (men), or problems with your sex drive. Both men and women should call their health care providers if headaches or visual problems occur.

Prevention    Return to top

Maintain normal body weight and healthy eating habits to prevent anorexia nervosa. Other causes may not be preventable.

References    Return to top

Sigman M, Jarow JP. Male infertility. In: Wein AJ, ed. Campbell-Walsh Urology. 9th ed. Philadelphia, Pa: Sauders Elsevier; 2007: chap 19.

Molitch ME. Anterior pituitary. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007: chap 242.

Swerdloff RS, Wang C. The testis and male sexual function. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007: chap 253.

White PC. Disorders of sexual differentiation. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007: chap 252.

Update Date: 8/1/2008

Updated by: Linda Vorvick, MD, Seattle Site Coordinator, Maternal & Child Health Lecturer, Pathophysiology, MEDEX Northwest Division of Physician Assistant Studies, University of Washington School of Medicine; Susan Storck, MD, FACOG, Clinical Teaching Faculty, Department of Obstetrics and Gynecology, University of Washington School of Medicine; Chief, Eastside Department of Obstetrics and Gynecology, Group Health Cooperative of Puget Sound, Redmond, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

A.D.A.M. Logo

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. Copyright 1997-2009, A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.