Meniere's disease is a disorder of the inner ear. It affects hearing and balance and presents with varying degrees of vertigo, tinnitus and deafness which wax and wane. It can indirectly cause nausea and vomitting. It's severity can vary widely from being a mild nuisance to a dehabilitating condition.
The underlying cause of the condition is unknown, but it appears to be linked to a buildup of fluid in the inner ear, which can be caused by numerous factors, such as failure of fluid to train or pressure on part of the inner ear.
Treatment usually focusses on managing triggers that can set off an attack, such as alcohol and allergies. However, if symptoms persist with conservative management, surgery can be considered to correct defects. This carried a risk of further and permanent hearing loss.
One of the most famous people to suffer from the condition was astronaut Alan Shepherd. He was grounded by the condition and had surgery so that he could command Apollo 14.