Shalaft's Syndrome is a very rare Terran illness in which the sufferer develops a hypersensitivity to sound, to the point where even a whisper can cause agony. Genetic in nature, it is passed down to every male in the family.
Starfleet officer Jean-Luc Picard suffered from Shalaft's Syndrome, as did his clone, Shinzon, when he was very young. Eventually Shinzon was taken to a doctor with experience in Human illnesses, and he was treated. Shinzon related this story to Captain Picard in 2379, when introducing himself to his counterpart. (Star Trek Nemesis)