What are the key differences between hypercalcemia and hypocalcemia, and how do they impact the body's calcium levels?

Hypercalcemia is a condition where there is too much calcium in the blood, while hypocalcemia is when there is too little calcium. Hypercalcemia can lead to symptoms like fatigue, nausea, and kidney stones, while hypocalcemia can cause muscle cramps, numbness, and seizures. Both conditions can disrupt the body's calcium balance, which is important for nerve function, muscle contraction, and bone health.