Guidelines for Laypersons in Identifying Dissociative Identity Disorder

Dissociative Identity Disorder (DID), formerly known as multiple personality disorder, is a complex mental health condition characterized by the presence of two or more distinct identity states within a single individual. These identities may take control of the person’s behavior at different times and are accompanied by memory gaps and disruptions in their sense of self, behavior, and functioning.
 
While only trained mental health professionals can diagnose DID, laypersons can look for certain patterns that may indicate the need for professional assessment. These include:

Noticeable shifts in behavior, voice, or mannerisms that seem abrupt and out of character for the person.

Recurrent memory gaps or episodes of amnesia, such as forgetting important personal information, daily events, or traumatic experiences, that cannot be explained by ordinary forgetfulness.

The person may refer to themselves using different names, ages, or identities, or talk about “parts,” “others,” or “voices” inside them.

Sudden changes in skills, handwriting, or preferences (e.g., food, clothing, hobbies) that are inconsistent with their usual behavior.

Experiences of feeling detached from oneself (depersonalization), feeling as if the world is unreal (derealization), or feeling as if thoughts, emotions, or actions are not their own.

Reports of hearing internal voices or conversations that are not related to psychotic disorders, such as schizophrenia.

Unexplained time loss, such as finding oneself in places without remembering how they got there (fugue) or discovering evidence of actions they do not recall.

Marked distress or problems in social, occupational, or other important areas of functioning due to these symptoms.
 
DID symptoms are often hidden or misunderstood, and the condition is frequently misdiagnosed as other mental health disorders (e.g., schizophrenia, borderline personality disorder; two of my previous patients were misdiagnosed with schizophrenia by mental health professionals and were prescribed with high dosages of antipsychotics). These symptoms must not be better explained by cultural or religious practices, substance use, or imaginary play in children. Only a qualified mental health professional can make a formal diagnosis of DID. If you notice these signs, encourage the person to seek professional evaluation. A layperson must not attempt to diagnose DID. The disorder is complex and requires specialized clinical expertise for proper assessment. Avoid confronting the person about having “multiple personalities,” as this can be distressing or stigmatizing. Refrain from making assumptions based on media portrayals, which are often inaccurate or sensationalized. If you observe the above symptoms and they cause distress or interfere with daily life, gently suggest seeking help from a mental health professional experienced in trauma and dissociation. In emergency situations (e.g., risk of harm to self or others), seek immediate assistance from available crisis services in your area.
 
People with DID can experience switches between identities (also called “alters”) in response to various triggers. These triggers are highly individual, but some common patterns have been observed. These may include the following:

Stressful situations, emotional distress, or reminders of past trauma are frequently reported as triggers for switching between identities.

The use of alcohol or drugs can provoke switching episodes in some individuals.

Certain places, people, sounds, or even seemingly neutral stimuli (like a specific song or watching certain TV programmes) can trigger a switch, especially if they are associated with past traumatic experiences or are meaningful to a particular alter.

Changes in seasons, holidays, birthdays, or anniversaries of traumatic events may act as triggers.

Fatigue, illness, or other physical changes can sometimes precede a switch.

The range of possible triggers is essentially limitless and varies from person to person. What acts as a trigger for one individual may not affect another.

Switching can be involuntary, and often the person with DID is not aware of the transition or may have memory gaps regarding the trigger event. The process may be subtle and hidden from others, with most people with DID becoming skilled at masking switches in daily life. Hence, triggers for switching in DID are diverse and highly personal, but stress, substance use, and emotionally significant cues are among the most reported.
 
Switching between identities in DID is often subtle and can be easily overlooked, even by those close to the individual. Some of the more nuanced signs include the following:

The person may appear to “shut down,” become unresponsive, or stare off into the distance for a moment.

There may be a sudden, unexplained shift in mood, temperament, or energy level.

The person might seem confused, disoriented, or unsure of what is happening around them.

They may have trouble recalling what just happened or seem to forget parts of conversations or activities.

Subtle physical signs can include heavy or slow blinking, muscle twitches, sighing, clearing the throat, or adjusting posture or clothing.

There may be a slight shift in voice pitch, tone, or facial expressions, sometimes accompanied by a pause before speaking.

The person might take longer to answer questions or seem to lose track of the conversation.

Actions like rubbing the eyes, yawning, or taking deep breaths may occur as the person grounds themselves during or after a switch.

​Posture, eye contact, or overall body language might subtly change, reflecting the presence of a different alter.

​These signs are often mistaken for tiredness, distraction, or normal mood changes. Most people with DID become skilled at masking switches, so these subtle cues may only be noticed by those who know them very well.
 
References
(2025, April 25). Dissociative Identity Disorder. In Wikipedia. https://en.wikipedia.org/wiki/Dissociative_identity_disorder
 
Dissociative Identity Disorder Diagnostic Guide. Guidelines for Treating Dissociative Identity Disorder in Adults, Third Revision, Journal of Trauma & Dissociation, 12 (2), 115 – 187. International Society for the Study of Trauma and Dissociation (2011). https://www.acc.co.nz/assets/provider/did-diagnostic-guide-acc8024.pdf
 
Bailey, A. (2024, September 5). Dissociative Identity Disorder: Identity Switch Triggers. Very Well Health. https://www.verywellhealth.com/dissociative-identity-disorder-switching-5212103

​DeMicoli, S. M. (2023). Dissociative Identity Disorder: A Literature Review. Portland State University. https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?params=/context/honorstheses/article/2578/&path_info=FINAL__Revised__Dissociative_Identity_Disorder__A_Literature_Review_by_Savannah_DeMicoli.pdf
 
Rehan, M.A., Kuppa, A., Ahuja, A., Khalid, S., Patel, N., Cardi, F.S.B., Joshi, V.V. & Tohid, H. (2018., July 10). Cureus 10 (7): e2957. National Library of Medicine. https://pmc.ncbi.nlm.nih.gov/articles/PMC6132594/
 
Reuben, K. (2021, November 12). Switching and Passive Influence. Dissociative Identity Disorder Research. https://did-research.org/did/identity_alteration/switching