In order to explain the reasoning behind hearing sounds, the ear is medically divided into three parts: the outer ear, the middle ear and the inner ear. When you look at the shape of the ear, there is a hole underneath it called the external auditory canal, and when you peer inside, you see a curved “canal” about 2 cm long, which is blocked by a layer of membrane-like tissue. This section is called the “outer ear”. The auricle collects sound and sends it in through this small hole. The skin of the outer ear canal has many glands that secrete some oil, and metabolize the skin and fine hairs to form earwax, which is medically called “cerumen”. When there is more of this, it blocks the transmission of sound. The skin of the external ear canal can become infected with boils just like the skin of other parts of the body, because the subcutaneous tissue is very dense and can be very painful. From that membrane on in, we can’t see it. In fact, it looks like a matchbox placed vertically. Inside there are three bones smaller than a grain of rice, listen to the small bones. This membrane is like the surface of a drum we hit, so it is called the tympanic membrane, and a little sound can be amplified on it. The three small bones inside are connected in a chain-like structure, which is like a lever, extremely clever to amplify the sound many times. This section of the structure is called the middle ear. The function of the middle ear is to amplify sound, which is the structure that turns sound energy into mechanical energy. For example, a decibel of sound reaching the end of the auditory tuberosity is 27 decibels. If there is fluid in this small space, which affects the vibration of the eardrum and the activity of the auditory tuberosity, then the sound cannot be effectively transmitted and amplified, and the sound heard will be smaller. For example, secretory otitis media, suppurative otitis media or growths in the middle ear can reduce the amplification of sound transmission, which is called “conductive deafness”.