Tetany is a medical condition characterized by muscle cramps, spasms, or twitching that can result in painful, involuntary muscle contractions. It often arises from an imbalance in the body’s electrolytes, particularly calcium, magnesium, or potassium. Tetany is a symptom characterized by the involuntary contraction of muscles that leads to painful muscle cramps, spasms of the voice box (i.e., larynx), and sensory disturbances. It is most commonly associated with low blood calcium levels, or hypocalcemia, although it can also appear with other metabolic irregularities. tetany , condition characterized by rhythmic cramping of the muscles of the hands and feet, muscle twitching, and possible spasms of the larynx, with difficulty breathing, nausea, vomiting, convulsions, and pain. Tetany is a symptom of involuntary muscle contractions and nerve overactivity caused by electrolyte imbalances. Learn about the common causes, signs and treatments of tetany , and when to seek medical help.