22 Hard-To-Detect Illnesses, From The Commonplace To The Truly Bizarre

17. Exploding Head Syndrome

Exploding head syndrome causes sufferers to hear loud noises, like a gunshot or fireworks explosion, or see flashes of light that aren’t there. And while the disease is pain free and does not cause serious health complications, it can develop at any time in your life and cause psychological stress. The cause is unknown, but the symptoms certainly won’t help anybody with their insomnia.