You may hear a single sound or two or more, and it’s common for the sounds to change. In other rare cases, people hear their tinnitus as rhythmical noises that beat at the same rate as their heart. This is known as pulsatile tinnitus, which is a type of objective tinnitus. Chronic cochlear disorders – There may be increased spontaneous activity in the hair cells and neurons, resulting in tinnitus. There are two different kinds of afferent fibers in the auditory nerve: inner hair cell fibers with large diameters and outer hair cells fibers with small diameters. Tinnitus, or ringing in the ears, affects as many as one in five people. Tinnitus is not a condition itself, but a symptom of another underlying problem. There are two types of tinnitus: objective and subjective. Objective tinnitus is very rare, and involves noise that can be heard by your doctor when they are performing an examination.