Manic-depressive disorder, also known as bipolar disorder, is a mental health condition that causes extreme mood changes. There are several synonyms for manic-depressive disorders, which can help people understand the condition better. Bipolar disorder, bipolar affective disorder, and manic depression are some of the common synonyms used for manic-depressive disorders. Some people may also use the terms manic-depressive illness, bipolar mood disorder, or bipolar spectrum disorder interchangeably with manic-depressive disorders. It is important to note that these different terms all describe the same condition and the symptoms can vary in severity, making accurate diagnosis and treatment critical to managing the condition effectively.