Which symptom may indicate hyperventilation?

The sensation of tingling in the fingers and toes is a common symptom associated with hyperventilation. This occurs because hyperventilation leads to decreased levels of carbon dioxide (CO2) in the bloodstream, a condition known as respiratory alkalosis. When CO2 levels drop, it can cause the blood vessels to constrict, particularly those supplying the extremities, which may result in the tingling or numbness sensations. This symptom reflects the body's response to changes in blood chemistry as a result of fast or excessive breathing. Understanding this connection is crucial for recognizing the physiological effects of hyperventilation.

Muscle spasms, while potentially related to the changes caused by hyperventilation, are not as directly indicative as the tingling experienced in the fingers and toes.