Ear Section Editor: Dr Ajit Man Singh Senior Consultant ENT & Head and Neck Surgery, Max Healthcare, New Delhi A hearing aid is an electronic, battery-operated device that amplifies and changes sound to allow for improved communication. Hearing aids receive sound through a microphone, which then converts the sound waves to electrical signals. Full Text » Topics & Information Valvular heart disease Enlarged Adenoids Tennis elbow Diet and cholesterol Stammering Learning disability Hirsutism Lipid profile Smoking Social behaviour in children Shyness in children Routine health care More »