In this article, an experienced diver with over 150 lifetime dives suddenly became ill after an otherwise uneventful dive except for some trouble clearing his right ear. He was given oxygen and transferred to the hospital. On the ride there, the vertigo and nausea he was experiencing lessened and by the time he reached the hospital he was able to sit up, his hearing however, continued to be muffled. After a number of tests, the doctor examined the divers ears. The left ear was normal, but the right ear had impacted cerumen (earwax) blocking the ear canal. Once the wax was removed, the eardrum was slightly reddened and his hearing returned to normal.
So, what happened?
In a nutshell, the earwax created plug which prevented the diver from fully equalizing his ears. This can happen to anyone! The body naturally produces earwax as a protection for the eardrum. However, some people produce more than others and this can lead to a buildup. During a dive, the excess wax is pushed toward the eardrum. This puts pressure on the eardrum and stops the ears from properly clearing. When an ear is not properly cleared it can cause vertigo, nausea, and other ear trauma.
In the above scenario, the diver's symptoms probably resolved because the air found a small hole through the wax which allowed his ears to equalize.
This uncomfortable situation can be prevented! Irrigating the ears before diving will help to remove any excess wax which will prevent a plug from happening. Ear Irrigating kits are available over the counter at your local pharmacy.
CAUTION: DO NOT OVERUSE!!! Irrigating too often can cause the ears to produce more wax and lead to the very problems we just discussed trying to prevent.