The main symptoms of<unk>  are the result of the low blood calcium level, which interferes with normal muscle contraction and nerve conduction. As a result, people with<unk>  can experience paresthesia, an unpleasant tingling sensation around the mouth and in the hands and feet, as well as muscle cramps and severe spasms known as "tetany" that affect the hands and feet. Many also report a number of subjective symptoms such as fatigue, headaches, bone pain and insomnia. Crampy abdominal pain may occur. Physical examination of someone with hypocalcemia may show tetany, but it is also possible to provoke tetany of the facial muscles by tapping on the facial nerve (a phenomenon known as Chvostek's sign) or by using the cuff of a sphygmomanometer to temporarily obstruct the blood flow to the arm (a phenomenon known as Trousseau's sign of latent tetany). A number of medical emergencies can arise in people with low calcium levels. These are seizures, severe irregularities in the normal heart beat, as well as spasm of the upper part of the airways or the smaller airways known as the bronchi (both potentially causing respiratory failure). Related conditions Condition Appearance PTH levels Calcitriol Calcium Phosphates Imprinting<unk>  Normal Low Low Low High Not applicable Pseudohypoparathyroidism Type 1A Skeletal defects High Low Low High Gene defect from mother (GNAS1) Type 1B Normal High Low Low High Gene defect from mother (GNAS1 and STX16) Type 2 Normal High Low Low High ? Pseudopseudohypoparathyroidism Skeletal defects Normal Normal Normal Normal gene defect from father
Hypoparathyroidism
Hypermagnesemia
Pseudohypoparathyroidism
Pseudopseudohypoparathyroidism
X-linked recessive hypoparathyroidism
Secondary hyperparathyroidism
Primary hyperparathyroidism
Tertiary hyperparathyroidism