Hyperparathyroidism is an excess of parathyroid hormone in the bloodstream due to overactivity of one or more of the body’s four parathyroid glands. These oval, grain-of-rice-sized glands are located in your neck. The parathyroid glands produce parathyroid hormone, which helps maintain an appropriate balance of calcium in the bloodstream and in tissues that depend on calcium for proper functioning.
Two types of hyperparathyroidism exist. In primary hyperparathyroidism, an enlargement of one or more of the parathyroid glands causes overproduction of the hormone resulting in high levels of calcium in the blood (hypercalcemia), which can cause a variety of health problems. Secondary hyperparathyroidism is a result of another disease that causes low levels of calcium in the body. Surgery is the most common treatment for hyperparathyroidism.
Hyperparathyroidism is often diagnosed before signs or symptoms of the disorder are apparent. When symptoms do occur, they are the result of damage or dysfunction in other organs or tissues due to high calcium levels circulating in the blood or too little calcium in bones.
Symptoms may be so mild and nonspecific that they don’t seem at all related to parathyroid function, or they may be severe. The range of signs and symptoms include:
- Fragile bones that easily fracture (osteoporosis)
- Kidney stones
- Excessive urination
- Abdominal pain
- Tiring easily or weakness
- Depression or forgetfulness
- Bone and joint pain
- Frequent complaints of illness with no apparent cause
- Nausea, vomiting or loss of appetite
When to see a doctor
See your doctor if you have any signs or symptoms of hyperparathyroidism. These symptoms could be caused by any number of disorders, including some with serious complications. It’s important to get a prompt, accurate diagnosis and appropriate treatment.
Hyperparathyroidism is caused by factors that increase the production of parathyroid hormone. The parathyroid glands maintain proper levels of both calcium and phosphorus in your body by turning the secretion of parathyroid hormone (PTH) off or on, much as a thermostat controls a heating system to maintain a constant air temperature. Vitamin D also is involved in regulating the amount of calcium in your blood.
Normally, this balancing act works well. When calcium levels in your blood fall too low, your parathyroid glands secrete enough PTH to restore the balance. PTH raises calcium levels by releasing calcium from your bones and increasing the amount of calcium absorbed from your small intestine. When blood calcium levels are too high, the parathyroid glands produce less PTH. But sometimes one or more of these glands produce too much hormone, leading to abnormally high levels of calcium (hypercalcemia) and low levels of phosphorus in your blood.
The mineral calcium is best known for its role in keeping your teeth and bones healthy. But calcium has other functions. It aids in the transmission of signals in nerve cells, and it’s involved in muscle contraction. Phosphorus, another mineral, works in conjunction with calcium in these areas.
The disorder can generally be divided into two types based on the cause. Hyperparathyroidism may occur because of a problem with the parathyroid glands themselves (primary hyperparathyroidism) or because of another disease that affects the glands’ function (secondary hyperparathyroidism).
Primary hyperparathyroidism occurs because of some problem with one or more of the four parathyroid glands:
- A noncancerous growth (adenoma) on a gland is the most common cause.
- Enlargement (hyperplasia) of two or more parathyroid glands accounts for most other cases.
- A cancerous (malignant) tumor is a rare cause of primary hyperparathyroidism.
Primary hyperparathyroidism usually occurs randomly, but some people inherit a gene that causes the disorder.
Secondary hyperparathyroidism is the result of another condition that lowers calcium levels. Therefore, your parathyroid glands overwork to compensate for the loss of calcium. Factors that may contribute to secondary hyperparathyroidism include:
- Severe calcium deficiency. Your body may not get enough calcium from your diet, often because your digestive system doesn’t absorb the calcium you consume.
- Severe vitamin D deficiency. Vitamin D helps maintain appropriate levels of calcium in the blood, and it helps your digestive system absorb calcium from your food. Your body produces vitamin D when your skin is exposed to sunlight, and you consume some vitamin D in food. If you don’t get enough vitamin D, then calcium levels may drop.
- Chronic kidney failure. Your kidneys convert vitamin D into a form that your body can use. If your kidneys function poorly, useable vitamin D may decline and calcium levels drop. Chronic kidney failure is the most common cause of secondary hyperparathyroidism.
You may be at an increased risk of primary hyperparathyroidism if you:
- Are a woman who has gone through menopause
- Have had prolonged, severe calcium or vitamin D deficiency
- Have a rare, inherited disorder, such as multiple endocrine neoplasia, type I, which usually affects multiple glands
- Have had radiation treatment for cancer that has exposed your neck to radiation
- Have taken lithium, a drug most often used to treat bipolar disorder
Lifestyle and Home Remedies
If you and your doctor have chosen to monitor, rather than treat, your hyperparathyroidism, the following suggestions can help prevent complications:
- Monitor how much calcium and vitamin D you get in your diet. The Institute of Medicine recommends 1,000 milligrams (mg) of calcium a day for adults ages 19 to 50 and men ages 51 to 70. That calcium recommendation increases to 1,200 mg a day if you’re a woman age 51 or older or a man age 71 or older. The Institute of Medicine also recommends 600 international units (IUs) of vitamin D a day for adults ages 19 to 70 and 800 IUs a day for adults age 71 and older. Talk to your doctor about dietary guidelines that are appropriate for you.
- Drink plenty of water. Drink six to eight glasses of water daily to lessen the risk of kidney stones.
- Exercise regularly. Regular exercise, including strength training, helps maintain strong bones. Talk to your doctor about what type of exercise program is best for you.
- Don’t smoke. Smoking may increase bone loss as well as increase your risk of a number of serious health problems. Talk to your doctor about the best ways to quit.
- Avoid calcium-raising drugs. Certain medications, including some diuretics and lithium, can raise calcium levels. If you take such drugs, ask your doctor whether another medication may be appropriate for you.