Sometimes people confuse three mental disorders, only one of which could be referred to as “common” within the population — bipolar disorder (also known as manic-depression), schizophrenia, and multiple personality disorder (also known by its clinical name, dissociative identity disorder). This confusion has largely resulted from the common use of some of these names in popular media, and as short-hand by people referring to someone who is grappling with a mental health issue. The disorders, however, have little in common other than the fact that many who have them are still stigmatized by society.

Bipolar Disorder

Bipolar disorder is a fairly common mental disorder compared with the other two disorders. Bipolar disorder is also well-understood and readily treated by a combination of medications and psychotherapy. It is characterized by alternating moods of mania and depression, both of which usually last weeks or even months in most people who have the disorder. People who are manic have a high energy level and often irrational beliefs about the amount of work they can accomplish in a short amount of time. They sometimes take on a million different projects at once and finish none of them. Some people with mania talk at a faster rate and seem to the people around them to be constantly in motion.

After a manic mood, a person with bipolar disorder will often “crash” into a depressive mood, which is characterized by sadness, lethargy, and by a feeling that there’s not much point in doing anything. Problems with sleep occur during both types of mood. Bipolar disorder affects both men and women equally and can be first diagnosed throughout a person’s life.

Bipolar disorder can be challenging to treat because, while a person will take an antidepressant medication to help alleviate a depressed mood, they are less likely to remain on the medications which help reign in the manic mood. Those medications tend to make a person feel “like a zombie” or “emotionless,” which are feelings most people wouldn’t want to experience. So many people with bipolar disorder find it difficult to maintain treatment while in their manic phase. However, most people with bipolar disorder function relatively well in normal society and manage to cope with their mood swings, even if they don’t always keep on their prescribed medications.

For more information about bipolar disorder, please see our Bipolar Guide.

Schizophrenia

Schizophrenia is less common than bipolar disorder and is usually first diagnosed in a person’s late teens or early to late 20’s. More men than women receive a diagnosis of schizophrenia, which is characterized by having both hallucinations and delusions. Hallucinations are seeing or hearing things that aren’t there. Delusions are the belief in something that isn’t true. People who have delusions will continue with their delusions even when shown evidence that contradicts the delusion. That’s because, like hallucinations, delusions are “irrational” — the opposite of logic and reason. Since reason doesn’t apply to someone who has a schizophrenic delusion, arguing with it logically gets a person nowhere.

Schizophrenia is also challenging to treat mainly because people with this disorder don’t function as well in society and have difficulty maintaining the treatment regimen. Such treatment usually involves medications and psychotherapy, but can also involve a day program for people who have more severe or treatment-resistant forms of the disorder.

Because of the nature of the symptoms of schizophrenia, people with this disorder often find it difficult to interact with others, and conduct normal life activities, such as holding down a job. Many people with schizophrenia go off of treatment (sometimes, for instance, because a hallucination may tell them to do so), and end up homeless.

For more information about Schizophrenia, please see our Schizophrenia Guide.

 

APA Reference
Grohol, J. (2006). The Differences Between Bipolar Disorder, Schizophrenia and Multiple Personality Disorder. Psych Central. Retrieved on December 18, 2014, from http://psychcentral.com/lib/the-differences-between-bipolar-disorder-schizophrenia-and-multiple-personality-disorder/000633
Scientifically Reviewed
    Last reviewed: By John M. Grohol, Psy.D. on 30 Jan 2013
    Published on PsychCentral.com. All rights reserved.