The American Tinnitus Association explains that the specific cause of tinnitus is not completely understood, but the condition is believed to be triggered by exposure to loud noises, ear wax blockages and head injuries. Tinnitus is also associated with medical conditions such as heart disease and hypothyroidism.
Individuals with tinnitus hear sounds such as clicking, roaring and buzzing inside of one or both ears, according to Mayo Clinic. Subjective tinnitus is the most common form of the condition and is typically associated with ear disorders or auditory nerve disorders. Objective tinnitus is a rare form of the condition that is believed to be linked to blood vessel disorders. Subjective tinnitus causes sounds that only the sufferers can hear inside of their ears. Objective tinnitus sounds can also be heard by physicians during auditory examinations.