Hypoparathyroidism is a rare endocrine disorder characterized by insufficient production of parathyroid hormone (PTH) from the parathyroid glands. This hormone is crucial for regulating calcium and phosphorus levels in the body. When PTH levels are low, it can lead to decreased calcium levels in the blood, resulting in symptoms such as muscle cramps, tingling sensations, and fatigue. The condition can be caused by various factors, including autoimmune diseases, genetic disorders, or damage to the parathyroid glands during thyroid surgery. Treatment typically involves calcium and vitamin D supplements to help manage symptoms and maintain normal calcium levels in the body.