Bipolar disorder is a mental condition characterized by extremes of mood. Psychiatrists are the medical professionals that diagnose this condition, usually through laboratory test and history taking. Often, they will ask the symptoms that concerns you and come up with the diagnosis after several tests. If you are doubtful about their diagnosis, you may directly tell your doctor that you think you are bipolar based on your understanding. This will erase all your worries about your actual diagnosis. For more information, please see: http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0001924/#adam_000926.disease.symptoms.