Merck Manual

Please confirm that you are not located inside the Russian Federation

Loading

Hyperaldosteronism

By

Ashley B. Grossman

, MD, University of Oxford; Fellow, Green-Templeton College

Last full review/revision Aug 2019| Content last modified Aug 2019
Click here for the Professional Version
GET THE QUICK FACTS
NOTE: This is the Consumer Version. DOCTORS: Click here for the Professional Version
Click here for the Professional Version

In hyperaldosteronism, overproduction of aldosterone leads to fluid retention and increased blood pressure, weakness, and, rarely, periods of paralysis.

  • Hyperaldosteronism can be caused by a tumor in the adrenal gland or may be a response to some diseases.

  • High aldosterone levels can cause high blood pressure and low potassium levels. Low potassium levels may cause weakness, tingling, muscle spasms, and periods of temporary paralysis.

  • Doctors measure the levels of sodium, potassium, and aldosterone in the blood.

  • Sometimes, a tumor is removed, or people take drugs that block the action of aldosterone.

Aldosterone, a hormone produced and secreted by the adrenal glands, signals the kidneys to retain more sodium and excrete more potassium. Aldosterone production is regulated partly by the hormone corticotropin (secreted by the pituitary gland) but mainly through the renin-angiotensin-aldosterone system (see figure Regulating Blood Pressure). Renin, an enzyme produced in the kidneys, controls the activation of the hormone angiotensin, which stimulates the adrenal glands to produce aldosterone.

Hyperaldosteronism can be caused by a tumor (usually a noncancerous adenoma) in the adrenal gland (a condition called Conn syndrome or primary hyperaldosteronism), although sometimes both glands are involved and are overactive. Sometimes hyperaldosteronism is a response to something else (a condition called secondary hyperaldosteronism), for example, certain diseases, such as narrowing of one of the arteries to the kidneys.

Eating large amounts of real licorice can cause all the symptoms of hyperaldosteronism. Real licorice contains a chemical that can act as though there is too much aldosterone. However, most candy sold as "licorice" contains little or no real licorice.

Symptoms

High aldosterone levels can lead to low potassium levels. Low potassium levels often cause no symptoms but may lead to weakness, tingling, muscle spasms, and periods of temporary paralysis. Some people become extremely thirsty and urinate frequently.

Diagnosis

  • Measurement of sodium, potassium, and hormone levels in the blood

  • Imaging tests of the adrenal glands

Doctors who suspect hyperaldosteronism first test the levels of sodium and potassium in the blood to see if the potassium level is low. However, sometimes people with hyperaldosteronism have a normal potassium level.

Doctors also measure renin and aldosterone levels. If the aldosterone level is high, spironolactone or eplerenone, drugs that block the action of aldosterone, may be given to see if the levels of sodium and potassium return to normal. Doctors also measure the levels of renin. In Conn syndrome, the levels of renin are also very low, but in secondary hyperaldosteronism, the levels of renin are high.

When too much aldosterone is being produced, doctors examine the adrenal glands for a noncancerous tumor (adenoma). Computed tomography (CT) or magnetic resonance imaging (MRI) can be helpful, but sometimes blood samples from each of the adrenal glands must be tested to determine the source of the hormone.

Treatment

  • For tumors of the adrenal glands, removal of the tumor

  • Sometimes aldosterone-blocking drugs

If a tumor is found, it can usually be surgically removed. When the tumor is removed, blood pressure returns to normal, and other symptoms disappear about 50 to 70% of the time.

If no tumor is found and both glands are overactive, partial removal of the adrenal glands may not control high blood pressure, and complete removal will cause Addison disease, requiring treatment with corticosteroids for life. However, spironolactone or eplerenone can usually control the symptoms, and drugs for high blood pressure are readily available (see table Antihypertensive Drugs). Spironolactone can often cause breast enlargement (gynecomastia), decreased sex drive, and erectile dysfunction in men by blocking the effects of testosterone.

Rarely do both adrenal glands have to be removed.

Drugs Mentioned In This Article

Generic Name Select Brand Names
ALDACTONE
INSPRA
NOTE: This is the Consumer Version. DOCTORS: Click here for the Professional Version
Click here for the Professional Version
Others also read

Also of Interest

Videos

View All
Thyroid Disease
Video
Thyroid Disease
The thyroid is one of several glands in the endocrine system. It is a butterfly-shaped gland...
3D Models
View All
Male Endocrine System
3D Model
Male Endocrine System

SOCIAL MEDIA

TOP