Hallucinations are sensations that appear real but are created by your mind. They can affect all five of your senses. For example, you might hear a voice that no one else in the room can hear or see an image that isn’t real. These symptoms may be caused by mental illness, the side effects of medications, or physical illnesses like epilepsy or alcoholism. You may need to visit a psychiatrist, a neurologist, or a general practitioner depending on the cause of your hallucinations. Treatment may include taking medication to cure a physical or mental illness. Your doctor may also recommend adopting healthier behaviors like drinking less alcohol and getting more sleep.