Hyperparathyroidism is a condition where the parathyroid glands, located in the neck, produce too much parathyroid hormone (PTH). This hormone helps regulate calcium levels in the body. When there is an excess of PTH, it can lead to high calcium levels in the blood, which may cause symptoms like fatigue, weakness, and kidney stones. There are two main types of hyperparathyroidism: primary and secondary. Primary hyperparathyroidism often occurs due to a benign tumor on a parathyroid gland, while secondary hyperparathyroidism usually results from another condition, such as kidney disease, that affects calcium balance. Treatment options vary depending on the type and severity of the condition.