What condition is characterized by increased levels of calcium in the blood?

The condition characterized by increased levels of calcium in the blood is hypercalcemia. This condition occurs when the concentration of calcium in the bloodstream is higher than normal, which can result from various factors such as overactive parathyroid glands, certain cancers, excessive vitamin D, or prolonged immobilization.

In hypercalcemia, elevated calcium levels can influence many body systems, including the heart, where it can lead to arrhythmias or changes in heart rate and rhythm due to its impact on the electrical conduction system. Additionally, hypercalcemia can also cause symptoms such as fatigue, confusion, frequent urination, and nausea.

Understanding hypercalcemia is crucial since it has specific implications for heart physiology and overall bodily function, distinguishing it clearly from the other listed conditions.