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 blood. When there is excess PTH, it can lead to high calcium levels, which may cause various health issues. There are two main types of hyperparathyroidism: primary and secondary. Primary hyperparathyroidism is often caused by a benign tumor on a parathyroid gland, while secondary hyperparathyroidism usually occurs due to low calcium levels from other health conditions, such as chronic kidney disease. Treatment options vary depending on the type and severity of the condition.