Which symptom is commonly associated with tetany?

Tetany is characterized by increased neuromuscular excitability, which often manifests as intermittent muscle spasms or twitching. This symptom occurs due to an imbalance of electrolytes, particularly low calcium levels, which can disrupt normal nerve and muscle function.

In cases of tetany, these muscle spasms can be painful and may affect different muscle groups in the body. It is an important clinical sign that healthcare providers look for when assessing a patient's electrolyte status, especially in those at risk for issues such as hypocalcemia.

The other symptoms listed—loss of appetite, frequent urination, and severe headaches—are not specific indicators of tetany. They may accompany various other medical conditions but do not align closely with the hallmark symptoms of tetany. Therefore, intermittent muscle spasms are the clear choice associated with this condition, making it the correct answer.