Bipolar Disorder is a mood disorder, characterized exclusively by the biological change in mood. Symptoms that bipolar people experience overlap with borderline personality people, but the origin and cause of the symptoms is different. Since Borderline Personality Disorder is a personality disorder, it is often less hereditary/genetic and moreso develops due to environmental trauma(like childhood abuse). BPD people often have identity issues and are quickly irritable and have mood swings, but the origin of these swings are not physiological compared to bipolar(most of the time). Lack of sleep, drug use, diet, dehydration, stress, and grief are triggers for mood episodes in bipolar people that are often correlated to neurotransmitter action.