What is a primary symptom indicating a diver should seek medical attention?

Persistent discomfort or pain is a primary symptom indicating that a diver should seek medical attention. This symptom could be indicative of underlying and potentially serious conditions such as decompression sickness or barotrauma, which can occur due to improper ascent or descent. Pain that persists after diving is not a common experience and should not be ignored, as it may escalate into more significant health issues if not addressed promptly. Medical evaluation is essential to determine the cause of the discomfort and to initiate any necessary treatment to prevent further complications.

In contrast, euphoria and excitement may arise from the experience of diving itself and do not typically signal a need for medical intervention. An increased heart rate can result from exertion, excitement, or stress associated with diving but does not alone indicate a medical emergency. Temperature fluctuations are generally not specific and can be caused by various factors; therefore, they are not considered a primary symptom that necessitates immediate medical attention.