Shingles is caused by the varicella-zoster virus â the same virus that causes chickenpox. Anyone who's had chickenpox may develop shingles. After you recover from chickenpox, the virus can enter your nervous system and lie dormant for years.
Hearing loss, also known as hearing impairment, is a partial or total inability to hear. A deaf person has little to no hearing. Hearing loss may occur in one or both ears. In children hearing problems can affect the ability to learn spoken language and in adults it can cause work related difficulties.
By National Institute of Deafness and Other Hearing Disorders. Presbycusis is the loss of hearing that gradually occurs in most individuals as they grow older. Hearing loss is a common disorder associated with aging. About 30 to 35 percent of adults between the ages of 65 and 75 years have a hearing loss. It is estimated that 40 to 50 percent of people 75 and older have a hearing loss. The loss associated with presbycusis is usually greater for high-pitched sounds.