Which symptom does NOT belong to the CONVENTID acronym?

The symptom that does not belong to the CONVENTID acronym is headaches. The CONVENTID acronym is designed to assist divers in remembering the symptoms associated with oxygen toxicity. CONVENTID stands for symptoms typically seen when divers are exposed to elevated partial pressures of oxygen. Each letter in the acronym corresponds to a specific symptom, and headaches are not included in this list.

The symptoms represented by the CONVENTID acronym include visual disturbances, irritability, dizziness, and others that are related to the central nervous system's response to high oxygen levels. Understanding this acronym helps divers recognize and manage potential oxygen toxicity while diving, making it a crucial part of safe diving practices.