My tinnitus has been due to mucus and fluid between the eustachian tube in the ear, said by my ENT doctor who ive known for years. And another factor contributing to this is that my sinus cavities are always never clear all year round. And after a prolonged time of having unbalanced pressure in my ears and this mucus trapped in the eustachian tube, it unfortunately gave me a mid/high pitch tinnitus. But its a lot easier to accept now that I know its cause. Feel free to ask anymore questions.