Some possible causes of numbness in the face are injuries, exposure to cold temperatures, neuropathy, multiple sclerosis and migraines, according to Healthgrades. Prolonged facial numbness is also associated with problems chewing and facial paralysis.
Injuries and exposure to cold temperatures cause facial numbness because blood circulation is impaired, which leads numbness. Neuropathy is commonly referred to as nerve damage and can be caused by excessive alcohol intake, lead poisoning and diabetes. Facial numbness is also a common symptom of multiple sclerosis, a condition characterized by damage to the brain, spinal cord and nervous system, notes MedlinePlus. Migraine headaches are often accompanied by nausea and facial numbness.