Once the pain lessens, dry the skin, and apply hydrocortisone ointment. The true cause of seasickness is still being debated. The leading theory involves confusion of signals to the brain, in which the visual system reports little movement of the immediate surroundings but the balance system in the inner ear senses much movement. The conflicting signals can lead to nausea and vomiting. Plan ahead to prevent seasickness.
Prevention is more effective than correcting the symptoms after they occur.
Medications most commonly used to prevent seasickness are dimenhydrinate, meclizine, and a prescription patch containing scopolamine. Divers should test these medications for 24 hours before a dive to identify any adverse reactions such as excessive drowsiness, confusion, or hallucinations that would render divers unfit to dive. Some people swear by home remedies such as ginger pills or elastic bands that place pressure on the wrist. Before boarding the boat, avoid overeating or eating greasy foods, which do not easily digest. Avoid caffeine, which may cause nausea, and avoid drinking alcohol.