Hypercalcaemia awareness
Informed by recognized medical guidance
Overview
Hypercalcaemia is a condition where the level of calcium in your blood is higher than normal. Calcium is important for strong bones, muscles, and nerves, but too much can cause health problems.
Key facts
- It is often caused by an overactive parathyroid gland (primary hyperparathyroidism).
- Some cancers can also lead to high calcium levels.
- Hypercalcaemia is treatable and often manageable with proper care.
It is fairly common, especially in older adults. Primary hyperparathyroidism is the most common cause.
It can affect anyone, but it is more common in women over 50 and people with certain medical conditions.
Symptoms
- Severe confusion or loss of consciousness
- Seizure
- Very high fever
- Unable to stay awake
- ⚠Severe nausea or vomiting that prevents drinking fluids
- ⚠Severe abdominal pain
- ⚠Very rapid or irregular heartbeat
- ⚠Signs of severe dehydration: dry mouth, sunken eyes, no urine for many hours
Common symptoms
- Fatigue and weakness
- Bone pain
- Frequent urination and excessive thirst
- Nausea, vomiting, or loss of appetite
- Constipation
Symptoms in children
- Poor feeding or vomiting
- Irritability
- Failure to grow or gain weight
Symptoms in older adults
- Confusion or memory problems
- Depression or mood changes
- Lethargy or drowsiness
Causes
Main causes
- Overactive parathyroid glands (primary hyperparathyroidism)
- Certain cancers (such as lung, breast, kidney, or multiple myeloma)
- Taking too much calcium or vitamin D supplements
- Some medications (like lithium)
- Prolonged bed rest or dehydration
Risk factors
- Being female and over 50
- Family history of hyperparathyroidism
- Certain medical conditions (like kidney disease)
- Long-term use of high-dose calcium or vitamin D supplements
When to see a doctor
See a doctor urgently if:
- If you have severe confusion, abdominal pain, or signs of severe dehydration
Book a routine appointment if:
- If you have mild symptoms like fatigue, thirst, or frequent urination that do not go away
Diagnosis
Hypercalcaemia is usually found through a blood test that measures your calcium level. Your doctor may also check your parathyroid hormone (PTH) level, vitamin D, and kidney function.
Tests that may be done
- Blood tests: calcium, PTH, vitamin D, kidney function
- Urine tests: to check how much calcium your body is getting rid of
- Imaging: bone density scan or ultrasound of the neck to look at the parathyroid glands
What to expect at your appointment
Your doctor will review your medical history and symptoms. You may need a series of blood tests. Depending on results, you may be referred to a specialist such as an endocrinologist.
Treatment
Treatment depends on the cause and how high your calcium level is. Some cases need only monitoring and lifestyle changes. Others require medication or surgery.
Self-care at home
- Stay well hydrated by drinking plenty of fluids (unless your doctor advises otherwise).
- Limit extra calcium and vitamin D supplements if your doctor says it is safe.
- Avoid prolonged bed rest; try to stay active.
Medical treatments
Doctors may give intravenous (IV) fluids to correct dehydration and lower calcium levels. Some medications can help reduce calcium release from bones or increase calcium elimination. If caused by overactive parathyroid glands, surgery to remove the affected gland(s) is an option. For cancer-related hypercalcaemia, treatment focuses on the underlying cancer.
When is surgery considered?
Surgery is often recommended for primary hyperparathyroidism, especially if you have symptoms, high calcium levels, or complications like kidney stones or osteoporosis. The surgeon removes the overactive parathyroid gland(s).
Living with this condition
Most people with mild hypercalcaemia can live normally with regular checkups and monitoring. If you have treatment, you may need to adjust your diet and stay hydrated.
Lifestyle tips
- Stay active but avoid prolonged bed rest.
- Drink enough water throughout the day.
- Limit alcohol and caffeine.
- Quit smoking.
Diet and exercise
Eat a balanced diet with moderate calcium intake (not too high, not too low). Dairy products in normal amounts are fine. Get enough vitamin D from sunlight or low-dose supplements if needed. Exercise regularly to keep bones strong.
Mental health and emotional wellbeing
Hypercalcaemia can cause mood changes, confusion, or depression. Talk to your doctor about any mental health symptoms. Treatment of the underlying condition often helps improve these symptoms.
Prevention
Not all cases can be prevented, but staying hydrated and avoiding excessive calcium or vitamin D supplements may help. If you have a family history, regular blood tests can detect it early.
Screening programmes
Routine blood tests during health checkups can detect hypercalcaemia early, especially in at-risk groups.
Complications
If left untreated
- Kidney stones or kidney damage
- Bone thinning and fractures (osteoporosis)
- Heart rhythm problems
- Confusion or coma
Long-term outlook
With proper treatment, the outlook is very good. Most causes of hypercalcaemia are manageable. Even in serious cases, treatment can bring calcium levels back to normal and prevent long-term problems.
Find support
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Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.
Sources and guidance
This article is educational and is prepared with reference to recognized health information and clinical guidance sources where available. Specific source links may vary by topic.
Last updated: July 16, 2026
Educational note: This information is for education only and is not a diagnosis.
Use it to support, not replace, advice from a licensed clinician.
If symptoms are severe, worsening, or urgent, call your local emergency number or seek emergency care.