You might not experience any signs or symptoms if your hypercalcemia is mild. More-severe cases produce symptoms related to the parts of your body affected by the high calcium levels in your blood. Examples include:
- Kidneys. Excess calcium in your blood means your kidneys have to work harder to filter it out. This can cause excessive thirst and frequent urination.
- Digestive system. Hypercalcemia can cause stomach upset, nausea, vomiting and constipation.
- Bones and muscles. In most cases, the excess calcium in your blood was leached from your bones, which weakens them. This can cause bone pain. Some people who have hypercalcemia also experience muscle weakness.
- Brain. Hypercalcemia can interfere with the way your brain works, resulting in confusion, lethargy and fatigue.
When to see a doctor
Contact your doctor if you develop signs and symptoms that may indicate hypercalcemia — such as being extremely thirsty, urinating frequently and having abdominal pain.