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Calcium is one of the most important and common minerals in the human body, playing a role in neural transmission, enzyme activity, myocardial function, and other cellular functions. However, too much calcium can cause health problems. Hypercalcemia, a condition in which calcium levels in the blood are higher than normal, can lead to muscle weakness, cramps, and twitches. This condition is often caused by hyperparathyroidism, certain cancers, or medications, and can be treated with surgery or medication. While mild cases may not exhibit noticeable symptoms, severe hypercalcemia can cause cardiac and neurological issues, and even lead to stupor or coma.
| Characteristics | Values |
|---|---|
| What is Hypercalcemia? | A medical condition where there is higher-than-normal calcium in the blood |
| What causes Hypercalcemia? | Primary hyperparathyroidism, certain cancers, excessive intake of calcium supplements, lung diseases, kidney failure, prolonged immobilization, and certain medications |
| How does it affect the muscles? | Hypercalcemia can cause muscle aches, weakness, cramping, twitching, and reduced muscle tone |
| What are some other symptoms? | Calcium renal stones, pancreatitis, peptic ulcers, abnormal heart rhythms, neurological symptoms (depression, memory loss, irritability), and in severe cases, stupor or coma |
| What are the treatment options? | Hypercalcemia can be treated with surgery and/or medication |
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What You'll Learn
Hypercalcemia and its causes
Hypercalcemia is a condition characterised by higher-than-normal levels of calcium in the blood. It can be mild or severe and temporary or chronic. Most cases are not life-threatening and are often caught early through routine blood tests. However, severe hypercalcemia can lead to serious complications, including kidney failure, abnormal heart rhythm, stupor, and coma.
The most common cause of hypercalcemia is excess parathyroid hormone (PTH) released by the parathyroid glands. This can occur due to an enlargement or growth on one or more of these glands, although these growths are typically benign. Hypercalcemia can also be caused by certain cancers, such as lung and breast cancer, that have spread to the organs. About 2% of all cancers are associated with hypercalcemia, and cancer-related cases often have a rapid onset and are severe.
Other causes of hypercalcemia include:
- Excess vitamin D in the blood (hypervitaminosis D), often due to excessive intake of vitamin D supplements.
- Prolonged immobilisation, especially in children.
- Excess calcium intake, often in the form of calcium supplements or calcium-based antacid tablets.
- Overactive thyroid gland.
- Chronic kidney disease or kidney failure.
- Certain medications, such as thiazide diuretics and lithium.
It is important to note that hypercalcemia can often be asymptomatic, and routine blood tests are crucial for early detection. Treatment depends on the underlying cause and severity of the condition. In some cases, surgery or medication may be required to lower calcium levels and manage symptoms.
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Hyperparathyroidism and its treatment
Hyperparathyroidism is a condition that causes an imbalance of calcium in the body. The parathyroid glands are located on or near the thyroid gland in the neck, and their only purpose is to make parathyroid hormone (PTH), which helps maintain the right balance of calcium in the body. PTH raises blood calcium levels by causing bones to release calcium into the blood and helping the kidneys retain calcium. When blood calcium levels are too low, the parathyroid glands release PTH to bring them back to normal.
Primary hyperparathyroidism occurs when one or more of the four parathyroid glands produce too much PTH, leading to abnormally high blood calcium levels (hypercalcemia). This can cause health problems such as bone thinning, kidney stones, heart disease, high blood pressure, and trouble concentrating. Most people with primary hyperparathyroidism have no symptoms, and it is usually detected early through routine blood tests.
Treatment options for hyperparathyroidism include watchful waiting, surgery, and medications. Surgery is the most common treatment and provides a cure in most cases. During surgery, the surgeon removes only the enlarged glands or those with tumors. If all four glands are affected, three may be removed, along with a portion of the fourth, leaving some functioning parathyroid tissue. Surgery is often performed as an outpatient procedure with local anesthesia and small incisions in the neck.
In some cases, medication may be prescribed to reduce PTH levels and control blood calcium levels. However, surgery is often preferred for long-term control of the condition. Radiation therapy is rarely used directly on the parathyroid glands but can be applied to parathyroid cancer that has spread to the bone.
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Medication-induced hypercalcemia
Hypercalcemia is a condition where a person has higher-than-normal levels of calcium in their blood. It can be caused by primary hyperparathyroidism, certain cancers, or medications. Medication-induced hypercalcemia can be caused by several commonly prescribed drugs, including:
- Thiazide diuretics: These increase calcium reabsorption in the kidneys, leading to higher blood calcium levels. Hydrochlorothiazide is an example of a thiazide diuretic.
- Vitamin D supplements and analogues: Excessive intake of vitamin D supplements can lead to increased intestinal calcium absorption, renal calcium reabsorption, and bone resorption, resulting in hypercalcemia.
- Lithium: Lithium alters the set point at which calcium suppresses parathyroid hormone, requiring higher levels of calcium for suppression.
- Teriparatide: This recombinant human parathyroid hormone is used to treat osteoporosis and can cause transient hypercalcemia.
- Calcium supplements: Taking too much calcium carbonate in the form of antacids like Tums or Rolaids is a common cause of temporary hypercalcemia.
- Other medications: Less common medications that can cause hypercalcemia include theophylline, foscarnet, growth hormone, omeprazole, aromatase inhibitors, and PTH analogues.
It is important to carefully assess prescription medications, over-the-counter supplements, and other substances a person may be taking to identify potential causes of medication-induced hypercalcemia.
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Calcium's role in the body
Calcium is the most abundant mineral found in the human body and is essential for overall health and well-being. It is a key player in many of the processes involved in daily bodily functions. Calcium is most well-known for its role in bone health, as 99% of the body's calcium is stored in bones and teeth. This large amount of calcium gives bones and teeth their strong, hard structure. Calcium is important for building and repairing bones, and a lack of calcium can lead to osteoporosis.
Calcium is also important for heart health. The movement of calcium in and out of heart cells triggers the contraction and relaxation of the heart muscle. Without calcium, the heart would not beat. Calcium also supports the mechanism that controls the rhythm and strength of the heartbeat. Calcium is an electrolyte, meaning it is electrically charged, and this charge is what causes the contraction and relaxation of the smooth muscles in the walls of the blood vessels. The contraction and relaxation of the small muscles lining the vessels cause the narrowing and widening of the blood vessels, which helps regulate blood pressure.
Calcium plays a role in nerve transmission, acting as a cellular gatekeeper, allowing insulin and other hormones into individual cells. It also helps cells release chemicals that enable cellular communication. Calcium is important for blood clotting, and it works with vitamin K and vitamin D to do this.
While calcium is essential for the body, it is possible to have too much. Excessive intake of calcium supplements can lead to hypercalcemia, which can cause muscle weakness, cramping, and twitches, as well as constipation, kidney stones, kidney failure, heart function problems, and confusion or cognitive problems.
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Symptoms of hypercalcemia
Hypercalcemia is a condition where there is too much calcium in the blood. It is often caused by hyperparathyroidism or certain cancers. While it can be mild or severe, temporary or chronic, it is usually detected during lab work for other reasons.
The symptoms of hypercalcemia can be remembered with the phrases "groans, bones, stones, moans, thrones, and psychiatric overtones". Groans refer to the moans and groans of pain, which can be generalised. Bones refer to the fractures that can occur as a result of osteoporosis. Stones refer to kidney stones, which can be caused by hypercalcemia. Thrones refers to the increased frequency of urination, or polyuria, that is a symptom of hypercalcemia. Psychiatric overtones refers to the neuropsychiatric effects of hypercalcemia, which can include confusion, stupor, or even coma in severe cases.
Other symptoms of hypercalcemia include constipation, muscle weakness, cramping, and twitches, as well as fatigue, nausea, vomiting, and anorexia. These symptoms are caused by several factors, including suppressed neural transmission, loss of the kidney's concentrating ability, other renal dysfunction, and effects on the central nervous system.
Cardiac manifestations of hypercalcemia can be life-threatening and include bradycardia, heart block, and other arrhythmias. Chronically high levels of calcium can also cause pancreatitis and peptic ulcers.
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Frequently asked questions
Hypercalcemia is a condition where you have higher-than-normal levels of calcium in your blood.
Hypercalcemia is caused by an excess of calcium in the bloodstream, which the body cannot regulate on its own. This is often due to overactive parathyroid glands, which produce too much parathyroid hormone (PTH).
Hypercalcemia can cause muscle weakness, aches, cramping, and twitches. It can also lead to neurological symptoms such as depression, memory loss, irritability, and confusion. In severe cases, it may even result in a coma.
Hypercalcemia can be treated with surgery and/or medication. Treatment options depend on calcium levels, symptoms, and the presence of other health conditions.
Yes, too much calcium can lead to hypercalcemia, which is associated with muscle weakness and various other symptoms. However, other factors, such as certain medications and conditions, can also contribute to muscle weakness.
