There are three types of dissociative disorders which are:
Dissociative Amnesia
Dissociative amnesia refers to memory loss that is more extreme than usual forgetfulness and cannot be explained by a medical condition. This typically involves not remembering a traumatic event or other information about themselves and people in their life. It can also include traveling or wandering away from home or normal day-to-day activities (dissociative fugue). An episode often occurs abruptly and can last minutes to hours, or rarely, months to years.
Dissociative Identity Disorder
Dissociative identity disorder (DID) is previously known as multiple personality disorder and typically involves dissociative amnesia or dissociative fugue. This complex psychological condition is the existence of two or more distinct identities or personality states. Distinct identities are determined by changes in behavior, thinking, and memory. Likely causes include traumatic or overwhelming events during childhood (usually extreme, repetitive physical, sexual, or emotional abuse).
Depersonalization-Derealization Disorder
Depersonalization-derealization disorder is a continuing feeling of being detached or outside your body. A person feels like they are observing themselves, their actions, thoughts, and feelings from a distance, like watching a movie (depersonalization). Their surroundings may feel like a dream, foggy, or unreal (derealization). People can experience both depersonalization and derealization, which may last a few moments or come and go over time.