Answer: The ear infection results in fluid growing in the area of the ear called the middle ear, and the fluid causes bones in the middle ear to not work the way they should causing hearing to be interfered.
Explanation: When a person gets a ear infection fluids starts to grow in the middle ear, and that part of the ear is also in the middle of the eardrum and inner ear which has a hearing nerve and then the brain will be sent waves from that nerve, and with that fluid certain bones in the middle ear that have the job of increasing the noise of a sound wave can't do it as they used to because that fluid also makes it so those bone in the middle ear can't move as much.