This is called as tinnitus, which is described as any sound emanating from the head not attributable to an external sound. One of the commonest cause for this is ear wax.
Tinnitus is not a disease but a symptom of some underlying health problem, usually in the ear, which would need physical examination and investigations to find out the cause.
Following are the common causes;
1) Exposure to persistent loud noise.
2) Ménière's disease.
3) Ear wax
4) Eustachian tube dysfunction
5) Environmental allergy
6) Blood pressure fluctuations
7) Diabetes and thyroid conditions
8) Medications are an extremely common cause of tinnitus
If you are taking any anti-inflammatory analgesics for any kind of pain like toothache, they should be stopped. All aspirin-containing products and nonsteroidal anti-inflammatory drugs should be discontinued. Supplements like vitamin A, vitamin C, cyanocobalamin, and nicotinic acid, with magnesium, zinc, or copper are suppose to help.
Ideally an examination by a physician or ENT specialist should be done for ascertaining the cause and further management. Read the resource on tinnitus;
Please feel free for your follow up questions.