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Endocrine glands
Endocrine glands


The pituitary gland
The pituitary gland


Pituitary hormones
Pituitary hormones


Hypogonadotropic hypogonadism

Definition:

Hypogonadism is a condition in which the male testes  or the female ovaries produce little or no sex hormones.

Hypogonadotropic hypogonadism (HH) is a form of hypogonadism that is due to a problem with the pituitary gland or hypothalamus.



Alternative Names:

Gonadotropin deficiency; Secondary hypogonadism



Causes:

HH is caused by a lack of hormones that normally stimulate the ovaries or testes: gonadotropin-releasing hormone (GnRH), follicle stimulating hormone (FSH) and luteinizing hormone (LH).

Normally:

  • The hypothalamus in the brain releases gonadotropin-releasing hormone (GnRH).
  • This hormone stimulates the pituitary gland to release FSH and LH.
  • These hormones tell the female ovaries or the male testes to release hormones that lead to normal sexual development in puberty.
  • Any change in this hormone release chain causes a lack of sex hormones and prevents normal sexual maturity.

There are several causes of HH:

  • Damage to the pituitary gland or hypothalamus from surgery, injury, tumors, infections, or radiation
  • Genetic defects
  • High doses or long-term use of opioid or steroid (glucocorticoid) medications
  • Severe stress
  • Nutritional problems (both rapid weight gain or weight loss)
  • Chronic medical diseases, including chronic inflammation or infections

Kallmann syndrome is an inherited form of HH. Some patients with Kallmann’s also have anosmia (loss of the sense of smell).
 



Symptoms:

Children:

  • In females, a lack of breasts and menstrual periods
  • In males, no development of sex characteristics, such as enlargement of the testes and penis, deepening of the voice, and facial hair
  • Inability to smell (in some cases)
  • Lack of development at puberty (development may be very late or incomplete)
  • Short stature (in some cases)

Adults:

  • Loss of sexual interest (libido) in men
  • Loss of menstrual periods (amenorrhea) in women
  • Decreased energy and interest
  • Loss of muscle mass in men
  • Weight gain


Exams and Tests:

Tests that may be done include:

  • Blood tests to measure hormone levels such as FSH, LH, and TSH, prolactin, testosterone and estradiol
  • LH response to GnRH
  • MRI of the pituitary gland/hypothalamus (to look for a tumor or other growth)
  • Genetic testing


Treatment:

Treatment depends on the source of the problem, but may involve:

  • Injections of testosterone
  • Slow-release testosterone skin patch
  • Testosterone gels (in males)
  • Estrogen and progesterone pills (in females)
  • GnRH injections


Outlook (Prognosis):

The right hormone treatment will cause puberty to start and may restore fertility. If the condition begins after puberty or in adulthood, symptoms will often improve with treatment.



Possible Complications:
  • Delayed puberty
  • Early menopause (in females) 
  • Infertility
  • Low bone density and fractures later in life
  • Low self-esteem due to late start of puberty (emotional support may be helpful)
  • Sexual problems such as low libido


When to Contact a Medical Professional:

Call your health care provider if:

  • Your child does not start puberty at the appropriate time 
  • You are a woman under 40 and your menstrual cycles stop
  • You have lost armpit or pubic hair
  • You are a man and you have decreased sexual interest


References:

Styne DM, Grumbach MM. Puberty: Ontogeny, neuroendocrinology, physiology, and disorders. In: Melmed S, Polonsky KS, Larsen PR, Kronenberg HM, eds. Williams Textbook of Endocrinology. 12th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 25.




Review Date: 8/1/2013
Reviewed By: Brent Wisse, MD, Associate Professor of Medicine, Division of Metabolism, Endocrinology & Nutrition, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional 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. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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Morristown Medical Center

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Morristown, NJ 07960
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Overlook Medical Center

99 Beauvoir Avenue
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