Spasms of the hands or feet that may be seen in association with hypocalcaemia or hyperventilation.

Hypocalcaemia is abnormally low calcium concentration, which can result in muscle cramps, abdominal cramps, spasms, and hyperactive deep tendon reflexes.

Hyperventilation refers to the depth and rate of breathing which is greater than that required by the needs of the body. Such a condition can cause dizziness and tingling of the fingers and toes.