Facial paralysis is a loss of facial movement due to nerve damage. Your facial muscles may appear to droop or become weak. It can happen on one or both sides of the face. Common causes of facial paralysis include:

infection or inflammation of the facial nerve head trauma head or neck tumor stroke

Facial paralysis can come on suddenly (in the case of Bell’s palsy, for example) or happen gradually over a period of months (in the case of a head or neck tuA more serious cause of facial paralysis is stroke. Facial paralysis occurs during a stroke when nerves that control the muscles in the face are damaged in the brain. Depending on the type of stroke, damage to the brain cells is caused by either lack of oxygen or excess pressure on the brain cells caused by bleeding. Brain cells can be killed within minutes in each case