Welcome to just answer.com
Loss of balance is usually described as dizziness or vertigo. A person who has vertigo feels that either he is spinning himself or things around him are spinning. Other features can be tilting, falling to one side, swaying etc. This feeling is often associated with nausea, headache, ringing in the ears, jerky movement of the eyes. Dizziness can last for few seconds to few minutes and sometimes for hours. It usually comes and goes.
It can be because of various reasons. Most common reason is a problem in the inner ear. Common cause is BPPV which is called benign paroxysmal positional vertigo which appears with the change of posture. It is a benign condition. It appears due to deposition of calcium in the inner ear canal. Sometimes it appears without any reason with the increasing age.
It can also be associated with inflammation of inner ear canal due to infection which is called vestibular neuritis or labyrinthitis. Most common reason is viral infection which usually improves after few days.
Vertigo can be associated with Meniere's disease which occurs due to accumulation of fluid in inner ear canal which leads to build up of pressure in the inner ear and loss of balance and ringing in era.
With increasing age there are degenerative changes in the cervical spine which leads to cervical spondylosis and feeling of dizziness.
If vertigo is persistent and bothersome, it can be associated with some serious underlying problem in part of the brain called cerebellum. So cerebellar disorders are associated with dizziness and loss of balance.
But having said that it should also be kept in mind that dizziness or loss of balance can also appear because of other reasons also. If some one has low hemoglobin or low blood in body due to any reason, dizziness or loss of balance . So get your blood checked to see Hemoglobin concentration.
Secondly get an x-ray of cervical spine to see if there are any degenerative changes.
Some times there is wax in the ear, in fact a very common problem, so please get your ears checked by an ENT doctor (Ear,nose, throat doctor), he might find wax in the ear, which can be removed easily and vertigo or dizziness goes away.
For persistent vertigo and loss of balance, neurologist's opinion must be taken, who may advice CT scan or MRI brain to look for brain diseases.
My opinion is to look for common reasons before thinking of serious disorders.
If you have any more queries, you are always welcome to ask.