Updated April 13, 2015.
Hypercalemia -- that is, and elevated calcium level in the blood -- is a common and serious complication, affecting 10 to 15% of people with advanced cancer. What are the symptoms, causes, and treatments, and what does this mean for you?
What is Hypercalcemia?
Hypercalcemia is defined as an elevated amount of calcium circulating in the blood. It is diagnosed by a simple blood test, and is checked frequently in people living with cancer.
An elevated calcium level is most common in people with lung cancer or breast cancer, but may occur with any type of cancer, especially cancers like lymphomas and multiple myeloma. With lung cancer it often occurs as a part of something referred to as paraneoplastic syndrome.
Symptoms:
An awareness of the symptoms of an elevated calcium may help you contact your doctor before it becomes a serious problem. Many of the symptoms are vague and can be present with conditions other than hypercalcemia, especially some cancer treatments, so it's important to be aware of them. Some of these include:
- Nausea
- Vomiting
- Loss of appetite
- Abdominal pain
- Increased thirst
- Decreased urination
- Weakness
- Constipation
- Muscle and joint pain
- Kidney stones
- Confusion, hallucinations, or personality changes
- Irregular heart rate
- When severe, coma and death
Causes:
There are several causes of a high calcium level in people with cancer. Some of these include:
- Release of calcium from cancer growing in bones (such as multiple myeloma) or spread of cancer to bones
- Secretion of substances by cancer cells that increase the calcium level (in paraneoplastic syndrome for example.) These substances act like parathyroid hormone (a hormone secreted by the parathyroid glands which sit behind the thyroid gland) and stimulate the release of calcium from the bones
- Kidney dysfunction in which the kidneys do not remove calcium from the blood as they are meant to do
- Dehydration
Treatments:
The treatment of hypercalcemia will vary depending upon how elevated your calcium is, as well as the cause. In addition to treating the tumor (which may decrease the level) other treatments include:
- IV fluids
- Steroids
- Medications to lower the calcium level such as bisphosphonates. Calcitonin, gallium nitrate, or mithramycin may sometimes be used. New therapies are being studied (such as demosumab) that appear promising for treatment in the future
- Dialysis if hypercalcemia is very severe
Prognosis:
Hypercalcemia can be a very serious complication of cancer (especially advanced cancer) but can be very treatable when caught early. In general, hypercalcemia is associated with a poorer prognosis overall for someone living with cancer.
Prevention:
Preventing hypercalcemia is the best treatment, and there are a few things you can do to help maintain a normal calcium level. Some of these include:
- Stay well hydrated, and call your doctor if you are nauseous and unable to keep fluids down
- Engage in regular physical activity
- Get enough salt in your diet
While staying well hydrated can help, decreasing the amount of calcium in foods you eat, such as avoiding dairy products, doesn't help prevent an elevated calcium level.
Sources:
Dartmouth-Hitchcock Norris Cotton Cancer Center. Hypercalcemia. Updated 11/09/12. http://cancer.dartmouth.edu/pf/health_encyclopedia/ncicdr0000062810
Lumachi, F. et al. Cancer-induced Hypercalcemia. Anticancer Research. 2009. 29(5):1551-5.
Maier, M., and S. Levin. Hypercalcemia in the Intensive Care Unit: A Review of Pathophysiology, Diagnosis, and Modern Therapy. Journal of Intensive Care Medicine. 2013 Oct 15. (Epub ahead of print).
Reagan, P., Rani, A., and M. Rosner. Approach to Diagnosis and Treatment of Hypercalcemia in a Patient with Malignancy. American Journal of Kidney Disease. 2013 Sep 7. (Epub ahead of print).
Source...