Hypoparathyroidism occurs when one or more of your parathyroid glands are underactive. You have four of these tiny glands. Each one is about the size of a pea. They are found in your neck, behind your thyroid gland. They keep the amount of calcium in your blood in a normal range. They also keep the levels of magnesium and phosphorus normal. If these glands are underactive, they don't make enough parathyroid hormone. This lowers the calcium level in your blood and increases the phosphorus levels. This imbalance may lead to muscle, teeth, and nerve problems.

The most common cause is injury to or removal of your parathyroid glands. That can happen during surgery to remove the thyroid. Some people are born without these glands. Or the glands don't work as well because of inherited diseases, an autoimmune condition, or unknown reasons. Sometimes hypoparathyroidism is caused by radiation treatments to the neck for neck cancer.

Symptoms are different for each person. The most common ones are:

• Uncontrollable, painful spasms of your face, hands, arms, and feet.
• A burning or prickling feeling (pins and needles) in your hands and feet, and around your mouth.
• Seizures.

These symptoms may look like other health problems. Children with undiagnosed hypoparathyroidism may have delayed tooth development and lots of cavities. They may also have a delay in mental development. Always see your doctor for a diagnosis.

Your doctor will ask about your past health. You will also need a physical exam. Blood and urine tests can also measure your calcium, phosphorus, and parathyroid hormone levels. You may need other tests.

Treatment will depend on your symptoms, age, and general health. It will also depend on how severe the condition is.

An I.V. (intravenous) infusion of calcium may be able to ease your symptoms right away if your calcium levels are very low. You may also need to take calcium and active vitamin D pills. You may also need to eat foods high in calcium and stay away from foods that are high in phosphorus. Wear a bracelet or other form of medical identification to let people know that you require daily calcium and vitamin D supplements and would likely need I.V. calcium in an emergency. In rare cases, this condition is treated with injections of parathyroid hormone.

Contact your doctor if your symptoms get worse. Also contact your doctor if you have new symptoms.

• Hypoparathyroidism happens when one or more of your parathyroid glands are not active enough. They don't make enough parathyroid hormone. This lowers the calcium and increases the phosphorus level in your blood, which causes an imbalance.
• The most common cause is injury to or removal of your parathyroid glands. That can happen during surgery to remove the thyroid.
• Symptoms may include painful spasms of your face, hands, arms, and feet. They may also include a burning or prickling feeling in your hands and feet and around your mouth.
• Blood tests can spot low levels of calcium and parathyroid hormones and high levels of phosphate.
• An I.V. (intravenous) infusion of calcium may be needed to ease your symptoms right away if your calcium levels are very low. You may also need to take calcium and vitamin D pills.

Tips to help you get the most from a visit to your doctor:

• Know the reason for your visit and what you want to happen.
• Before your visit, write down questions you want answered.
• Bring someone with you to help you ask questions and remember what your doctor tells you.
• At the visit, write down the name of a new diagnosis, and any new medicines, treatments, or tests. Also write down any new directions your doctor gives you.
• Know why a new medicine or treatment is prescribed, and how it will help you. Also know what the side effects are.
• Ask if your condition can be treated in other ways.
• Know why a test or procedure is recommended and what the results could mean.
• Know what to expect if you do not take the medicine or have the test or procedure.
• If you have a follow-up appointment, write down the date, time, and purpose for that visit.
• Know how you can contact your doctor if you have questions.