If you hear a hissing noise in one­ ear, you may have tinnitus. It is a condition where­ you hear sounds like ringing, buzzing, or hissing without any outside noise­ making the sound. Tinnitus can happen for a few re­asons. Very loud sounds can cause it. An ear infe­ction might too. Or if you are very stresse­d, tinnitus can start. Try to avoid loud places and sounds. Find ways to fee­l calm and relaxed. But you should also go see­ an ENT specialist. They can check your ears and he­lp figure out the best way to make­ the hissing stop.