Bipolar disorder not otherwise specified (BP-NOS) is the diagnostic category that mental health professionals use when describing bipolar symptoms that don't fit the criteria for an official form of bipolar illness. As such, the category acts as a generalized depository for bipolar-related characteristics. Despite its catchall nature, a BP-NOS diagnosis is medically serious. In many cases, people who receive this diagnosis eventually develop an official bipolar condition. Even when this sort of development does not occur, the impact of bipolar-related symptoms can seriously disrupt the lives of affected individuals. Bipolar Disorder Basics Bipolar disorder is the medically correct term for manic-depression or manic-depressive illness. Along with a group of conditions called depressive disorders, it constitutes a category of mental illnesses known as mood disorders. While most people think of the condition as a single entity, there are actually three distinct forms of bipolar disorder, known as bipolar I disorder, bipolar II disorder and cyclothymia. People with bipolar I disorder periodically experience episodes of an unusually aroused, energized state called mania, as well as episodes that combine features of mania with features of clinical depression. This form of the disorder also typically produces episodes of unmixed depression. People with bipolar II disorder experience depressive episodes that alternate with a limited or subdued form of mania called hypomania. People with cyclothymia experience alternating periods of hypomania and relatively mild depression that recur for a minimum of two years. Mental health professionals in the US use bipolar disorder guidelines set forth by the American Psychiatric Association in a document called the Diagnostic and Statistical Manual of Mental Disorders. Compared to many other mental disorders, the guidelines for a bipolar disorder diagnosis are relatively strict. For instance, if a person with symptoms of bipolar II disorder experiences even a single episode of full-blown mania (rather than hypomania), he or she technically does not have bipolar II disorder, even if that manic state never reoccurs. Bipolar Disorder Not Otherwise Specified Basics As indicated previously, people with BP-NOS have clear bipolar symptoms but don't meet the criteria for bipolar I disorder, bipolar II disorder or cyclothymia. In some cases, affected individuals have symptoms that strongly resemble the problems associated with these illnesses, but lack one of the defining characteristics that doctors need to make an official diagnosis. In other cases, they have mixed or conflicting symptoms that fall outside of the scope of the three official bipolar disorders. Situations that can lead to a BP-NOS diagnosis include the presence of manic or depressive symptoms that only appear for a day or two at a time, the presence of hypomania without corresponding episodes of depression, the presence of manic and depressive symptoms that rapidly cycle back and forth, and the presence of manic or mixed manic-depressive symptoms in someone with a history of schizophrenia or some other form of psychosis. In some instances, doctors may also decline to verify the presence of an official bipolar disorder in people who drink heavily, abuse drugs or have certain physical conditions that can contribute to significant mood alterations. Seriousness of BP-NOS Despite the lack of a bipolar I, bipolar II, or cyclothymia diagnosis, people with BP-NOS still have a bipolar condition. In fact, it's not uncommon for a person who initially received a BP-NOS diagnosis to later receive a more specific diagnosis for one of the three main disorders. This can happen if doctors misidentify existing symptoms of an official disorder, but it more typically happens when an affected individual eventually develops additional bipolar-related symptoms. Because of the provisional nature of BP-NOS, people with generalized bipolar symptoms are strongly encouraged to remain under the care of a mental health specialist and undergo periodic follow-up evaluations whenever their symptoms recur. Considerations If left untreated, bipolar symptoms commonly grow worse over time. In some cases, these symptoms may start to appear more frequently; in other cases, they may grow increasingly severe. Unfortunately, some people experience both of these phenomena at the same time. Since bipolar disorder not otherwise specified is not a defined collection of symptoms, doctors have no established treatment regimen for people who receive a BP-NOS diagnosis. Typically, monitoring and follow-up evaluation must suffice unless the affected individual eventually develops more symptoms. Mental health conditions that commonly appear simultaneously in people with bipolar symptoms include attention-deficit hyperactivity disorder (ADHD), social anxiety disorder (social phobia) and post-traumatic stress disorder (PTSD). In addition, people with bipolar symptoms often abuse alcohol or drugs and develop health problems such as heart disease, thyroid disorders, obesity, migraines and type 2 diabetes. In some cases, these problems may help trigger the onset of bipolar-related symptoms; in other cases, treatments used to address bipolar-related symptoms may increase risks for these problems.