Hallucinations are when you see, feel, hear, smell, or taste things that aren’t there. Auditory hallucinations make you hear voices or sounds. Visual hallucinations make you see imaginary objects, or see real objects differently. Olfactory hallucinations cause odors that only you can smell, and tactile hallucinations can make it seem like your skin is crawling with bugs. Gustatory hallucinations give you strange tastes in your mouth.