What you have is probably tinnitus or an abnormal sound in the ear which does not have a source in the outside world, originates internally and can be heard as a ringing, swishing, pounding, flashes—etc. There are many medical causes for tinnitus. Besides loud noises, other causes include severe head trauma, sinus and respiratory infections, ear infections, wax build-up, high blood cholesterol, food allergies, and certain types of tumors.
Other possible causes of tinnitus have their origin in either your ear (Ménière's disease, otosclerosis, middle ear infections, wax in your ear canal and TMJ), or auditory nerve (which carries signals from your inner ear to your brain like acoustic neuroma), and side-effects of medicines (aspirin, quinine, some antibiotics etc). Tinnitus can also be stress related.
Sometimes it can be a pulsatile tinnitus where you hear your own pulse. The most common cause of pulsatile tinnitus is noisy blood flow as blood pushes through plaques or kinks in the arteries in the head or neck. It can be made worse if there is also hypertension. Several types of fistulas in the blood vessels of head and neck, especially the carotid artery or jugular vein can also cause this.
Increased blood flow as seen in anemia and hyperthyroid state can also cause pulsatile tinnitus. Fluid in middle ear can be another cause. Vascular tumors of middle ear such as glomus tumors or paragangliomas can also cause this.
Please consult an ENT specialist and a vascular specialist for this. You may need angiograms, dopplar studies of vessels of head and neck and may be CT scans of ear. Take care!
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