Hypercalcemia is a medical condition characterized by elevated levels of calcium in the blood. Normal calcium levels typically range from 8.5 to 10.2 mg/dL, and when levels exceed this range, it can lead to various health issues. Common causes include overactive parathyroid glands, certain cancers, and excessive intake of vitamin D or calcium supplements. Symptoms of hypercalcemia may include fatigue, nausea, vomiting, and increased thirst. If left untreated, it can result in more severe complications such as kidney stones, bone pain, and abnormal heart rhythms. Diagnosis usually involves blood tests, and treatment focuses on addressing the underlying cause and lowering calcium levels.