Hallucinations are unreal sensory experiences, such as hearing or seeing something that is not there. Any of our five senses (vision, hearing, taste, smell, touch) can be involved. Most often, when we ...

Hallucinations refer to the experience of sensing things that seem real but do not exist. During a hallucination, you may see, hear, feel, smell, or taste things that are not there—meaning they have ...

Medically reviewed by Arno Kroner, DAOM Key Takeaways Sleep deprivation can start causing hallucinations after just 24 hours ...

Hallucinogen persisting perception disorder (HPPD) is a rare medical condition that can cause visual disturbances (sometimes called flashbacks) if you’ve taken hallucinogenic drugs in the past. With ...