Dive Illnesses and Treatments Practice Test 2026 – The All-in-One Guide to Master Your Exam!

The key idea is that late signs of a dive illness that point to a serious progression are new or worsening neurological problems, especially if there’s sudden collapse even after things seemed to get better. Neurologic deterioration or a sudden collapse suggests CNS involvement from decompression illness or a cerebral gas embolism, both of which are life-threatening and require urgent treatment (often recompression and high-flow oxygen) as soon as possible.

Other symptoms like a cough, dizziness, or chest pain can occur with dive-related gas effects, but on their own they don’t carry the same red-flag urgency as a new or worsening neurological deficit with collapse. If a diver who had improved starts showing these neuro changes or collapses, treat it as a medical emergency and seek rapid recompression care.