14597 Hypercalcemia

Overview

Hypercalcemia means there is too much calcium in your blood. Calcium is needed for strong bones, healthy muscles, and a well-functioning heart and nervous system. But when the level gets too high, it can disrupt how your body works and lead to symptoms such as thirst, tiredness, or confusion.

Hypercalcemia is not extremely common in the whole population, but it is the most common electrolyte problem seen in hospital patients. In general practice, mild hypercalcemia is encountered regularly, especially in older adults having blood tests for other reasons.

It can affect anyone, but it is most often diagnosed in adults over 50, particularly women. People with certain chronic illnesses, some cancers, kidney problems, or who take certain medicines or supplements are at higher risk.

Symptoms

Common symptoms

• No symptoms at all, especially when calcium is only slightly elevated
• Increased thirst and frequent urination
• Constipation
• Nausea or poor appetite
• Tiredness and weakness
• Muscle aches or twitches
• Brain fog or difficulty concentrating

Symptoms in children

• Poor feeding or refusal to eat
• Irritability or unusual sleepiness
• Abdominal pain
• Vomiting
• Slow growth or weight loss

Symptoms in older adults

• Confusion or disorientation
• Memory problems
• Balance problems or falls
• Dehydration
• New or worsening fatigue

Causes

Main causes

• Primary hyperparathyroidism — the parathyroid glands (four small glands in your neck) make too much parathyroid hormone, which raises blood calcium
• Cancer — some cancers, especially lung, breast, or myeloma, can release substances that increase blood calcium
• Certain medicines, such as some mood stabilisers and blood pressure tablets, can raise calcium as a side effect
• Excessive calcium or vitamin D supplements
• Long periods of bed rest or immobility, which can cause calcium to move from bones into the blood
• Chronic kidney disease
• Sarcoidosis and certain other inflammatory conditions

Risk factors

• Being over 50 years old
• Being female
• A family history of parathyroid disorders or hypercalcemia
• Dehydration
• Prolonged immobility
• High-dose calcium or vitamin D supplements
• A current diagnosis of cancer
• Chronic kidney disease

When to see a doctor

See a doctor urgently if:

• If you have any of the emergency symptoms listed above, call your local emergency number immediately
• If you have persistent vomiting, cramping, or feel increasingly confused, seek same-day urgent care

Book a routine appointment if:

• If you have ongoing thirst, tiredness, constipation, or muscle aches, make an appointment with your doctor
• If a blood test has shown slightly high calcium, see your doctor to discuss repeat testing and next steps

Diagnosis

Hypercalcemia is diagnosed with a simple blood test that measures the calcium level in your blood. If the result is high, your doctor will usually repeat the test to confirm it and may check other blood tests to find the cause.

Tests that may be done

• Blood calcium level (may be corrected for protein levels in the blood)
• Parathyroid hormone (PTH) test
• Kidney function tests
• Vitamin D level
• Electrocardiogram (ECG) to check the heart, if calcium is very high
• Bone density scan (DEXA) if long-term damage is suspected

What to expect at your appointment

Your doctor will talk with you about your symptoms, medical history, and medicines. If calcium is very high, you may be sent to the hospital for fluids and more tests. For mild and moderate cases, you will likely be referred to an endocrinologist (a hormone specialist) or a kidney specialist to confirm the cause and plan follow-up.

Treatment

Treatment depends on how high your calcium level is, whether you have symptoms, and what is causing the condition. Mild hypercalcemia may need only regular monitoring and simple measures such as staying well hydrated. Moderate to severe hypercalcemia requires medical care, often in hospital, with fluids given through a drip and medicines that help your body remove extra calcium. The underlying disease, such as overactive parathyroid glands or cancer, must also be treated.

Self-care at home

• Drink plenty of water every day unless your doctor advises otherwise
• Avoid large doses of calcium and vitamin D supplements unless prescribed by your doctor
• Stay active and avoid long periods of bed rest if you are able
• Take all your medicines exactly as prescribed and tell your doctor about any supplements or over-the-counter products you use
• Keep regular follow-up appointments for blood tests

Medical treatments

For more severe hypercalcemia, doctors typically give intravenous (through a vein) fluids to rehydrate you and help the kidneys remove calcium. They may also use medicines that reduce calcium release from the bones or increase calcium removal in urine. It is important to know that these are general treatments — the exact approach will be chosen by your doctor based on your condition and its cause. Never take any medicine for hypercalcemia without your doctor's guidance.

When is surgery considered?

If you have primary hyperparathyroidism — meaning one or more parathyroid glands are overactive — the most common curative treatment is a small operation to remove the abnormal gland(s). This is generally considered when calcium levels are clearly elevated, or if you have symptoms, kidney stones, or bone thinning. Your surgeon and endocrinologist will discuss whether surgery is right for you.

Living with this condition

Living with hypercalcemia mostly means staying on top of your health: drinking enough fluids, staying active, and keeping your scheduled blood tests. If your calcium level is only mildly high, you may not notice any change in your daily life. If you have an underlying condition, managing it well usually keeps the calcium level in check.

Lifestyle tips

• Drink water throughout the day, aiming for enough so that your urine is light in colour
• Stay physically active with activities you enjoy, such as walking or gardening
• Avoid prolonged bed rest or being inactive for weeks at a time
• Limit calcium and vitamin D supplements to the amounts recommended by your healthcare team
• If you smoke, talk to your doctor about stopping, as smoking can complicate some underlying conditions

Diet and exercise

In most cases, you do not need to avoid calcium-rich foods. A healthy balanced diet with plenty of vegetables, fruits, and whole grains is recommended. Drinking fluids helps your kidneys process calcium. Exercise, particularly weight-bearing activity like walking or stair climbing, helps keep bones strong. If you have a condition such as sarcoidosis, your doctor may advise limiting extra vitamin D and calcium supplements, so always follow their individual advice.

Mental health and emotional wellbeing

Dealing with a chronic condition can be stressful. High calcium itself can affect your mood, causing irritability, low mood, or concentration problems. It is normal to feel anxious or overwhelmed. Talk to your healthcare team about your worries — they can help you understand your results and reassure you when things are stable.

Prevention

Most cases of hypercalcemia cannot be prevented, especially those caused by overactive parathyroid glands or cancer. However, you can reduce some risk by staying well hydrated, avoiding excessive supplements of calcium and vitamin D, keeping active, and monitoring chronic conditions like kidney disease. If you are on bed rest for a long time, ask your doctor about safe exercises or other ways to reduce calcium release from bones.

Screening programmes

Routine blood tests for other health reasons sometimes detect hypercalcemia early. If you have a condition that raises your risk, your doctor may recommend periodic calcium checks. Ask your GP whether you need regular testing.

Complications

If left untreated

• Kidney stones, caused by too much calcium in the urine
• Kidney damage or kidney failure
• Bone thinning (osteoporosis) and higher risk of fractures
• Irregular heart rhythms, including potentially dangerous changes in heart rate
• Nervous system effects, such as severe confusion, seizures, or coma
• High blood pressure due to calcium affecting blood vessels

Long-term outlook

The outlook for hypercalcemia is generally very good, especially when it is mild and caught early. For most people, treatment of the underlying cause — or simple monitoring — keeps the condition well controlled. Even in more serious cases, modern medicine has effective ways to lower calcium quickly and safely. With the right support and follow-up, many people with hypercalcemia live full and healthy lives.

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