Subjective Tinnitus: Only you can hear the sound, usually caused by ear problems.Objective Tinnitus: Your doctor can hear the sound during an examination, often caused by blood vessel issues or muscle contractions.Bilateral Tinnitus: Heard in both ears, common and usually not serious.Unilateral Tinnitus: Heard in one ear, which could indicate a serious underlying condition.Pulsatile Tinnitus: Rhythmic tinnitus in sync with your heartbeat, often indicating a change in blood flow to the ear.