Whether it is a child's hearing aid or an elderly hearing aid, it is important to keep the hearing aid clean and dry at all times.When the hearing aid is turned on, it makes a "beep" howling, especially when it is taken out or placed in a hearing aid.Howling is often caused by the amplified sound being reflected by the hand or other objects and then re-acquired into the microphone.When the hand or reflector is removed, the howling should stop.