Mucopolysaccharidosis (MPS) cuta ce da ba kasafai ake gada ta rayuwa ba wacce ke shafar ikon jiki na rushe hadadden carbohydrates da ake kira glycosaminoglycans (GAGs). GAGs wani muhimmin abu ne na kyallen takarda da yawa a cikin jiki, gami da guringuntsi, kashi, tendons, da fata. Wannan yana haifar da tarin GAGs a cikin ƙwayoyin jiki da kyallen takarda, wanda zai iya haifar da nau'in bayyanar cututtuka, ciki har da jinkirin ci gaba, rashin daidaituwa na kwarangwal, haɓakar gabobin jiki, da kuma rashin lafiyar jiki. Akwai nau'ikan MPS da yawa, kowannensu yana da alamomi daban-daban da tsanani.