Labyrinthitis is an inner ear infection that causes nausea, vomiting, loss of balance, headaches, and ringing in the ears. The causes are often unknown but may include bacterial infections, trauma, inflammation, or viruses like those that cause colds and flu. While symptoms can last for weeks depending on severity, medical attention should be sought if dizziness makes basic movements difficult. Doctors may order imaging tests for severe cases and prevention focuses on avoiding injury through good hygiene.