Ear Wax Blockage According to the Mayo Clinic, Ear Wax blockage occurs when earwax or cerumen accumulates and becomes too hard to wash away naturally. The body needs earwax is part of the body’s natural defense system. The ear wax protects the ear canal by slowing bacteria and trapping dirt . Causes of Ear Wax Blockage The ear wax usually makes it way to the opening of the ear where it falls out or is removed by daily washing.