Illness was originally thought to be caused by

God (punishment)

While some diseases have been wiped out by advancing medicine, some still exist today. Back when medicine has relied on religion, spiritual and traditional beliefs, people believed a "higher power" causes the illnesses. They believed that God gave the illnesses as punishment for sins or disobedience. Consequently, the people believed that the treatment for these illnesses are rituals and prayers.

answer; /// i believe its the cochlea;