For much of his adult life, Charles Darwin's health was repeatedly compromised by an uncommon combination of symptoms, leaving him severely debilitated for long periods of time, incapable of normal life and intellectual production, staying in bed most of the time for months. Charles Darwin wrote, "Constant attacks...makes life an intolerable bother and stops all work."
He consulted with more than 20 doctors, but, with the medical science of the time, the cause remained undiagnosed. He tried all available treatments, but, at best, they had only temporary success. More recently, there has been much speculation as to the nature of his illness.