American Board of Family Medicine (ABFM) Practice Exam 2026 - Free ABFM Practice Questions and Study Guide

Hypoparathyroidism is characterized by an insufficient secretion of parathyroid hormone (PTH), leading to low levels of calcium in the blood (hypocalcemia). One of the hallmark symptoms associated with hypoparathyroidism is muscle twitching, or tetany. This occurs because low calcium levels increase neuromuscular excitability, resulting in involuntary muscle contractions and spasms.

Fatigue can occur in various conditions, but it is too nonspecific to be considered a direct symptom of hypoparathyroidism. While it may be experienced by some patients, it is not as definitive or classic as muscle twitching.

Weight loss is not typically associated with hypoparathyroidism. Instead, it tends to occur in conditions where metabolism is increased or in situations involving significant systemic illness.

Tachycardia may be observed in several disorders, particularly those involving the cardiovascular system or hyperthyroid conditions, but it is not a direct consequence of hypoparathyroidism. Instead, the condition is more associated with bradycardia or a slower heart rate due to effects on muscle tone and nerve conductivity from low calcium levels.

Thus, muscle twitching is the most distinctive and relevant symptom when considering hypoparathyroidism, as