12-year-old Katelyn Thornley, who sneezes up to 12,000 times a day (20 times per minute), said she is constantly in pain and weak, and can barely eat.

The 12-year-old wishes she could just leave her body for a while, and said that even in her dreams, she sneezes. The mysterious condition in Katelyn occurred after a clarinet lesson, but her parents assumed that it was just an allergy that would go away.
Typical conditions that cause regular sneezing, such as viruses, colds and allergies, have been ruled out. Doctors have suggested that stress may be the main cause.
Source-Medindia