“Approximately 1 out of every 1000 children is born with unilateral hearing loss.” As an adult, the cause of unilateral hearing loss is typically noise exposure on one side of your body, such as shooting a gun, working in a factory, or driving (an open window can exceed 90db on a busy highway). Also, a unilateral loss could caused be from an obstruction in the ear canal such as a foreign object (I’ve actually seen a cricket in someone’s ear canal), a cyst, earwax or a growth. Bone damage, otosclerosis disease and infections of the inner ear are a few more serious causes of unilateral hearing loss.
Usually Both Ears
You should have your hearing evaluated by a professional (http://www.hearingaidbid.com/
Unilateral Loss Treatment
Treatment of a unilateral loss can be as simple as having a professional recommend the correct hearing aid for your loss or having wax removed if that is the cause. Other treatments will vary depending on the cause of the loss.
There are many options out there to help with a unilateral hearing loss. If you think that you have a loss in one ear, have your hearing evaluated by a professional. It doesn’t take much time and you will find out, leaving the presence of the unknown in the past.
"American Speech Language Hearing Association"