The mood disorder where a person goes from feeling really down to feeling really up and nothing in between is called bipolar disorder.
In bipolar disorder, individuals experience extreme mood swings, known as manic and depressive episodes. During manic episodes, a person may feel excessively happy, energetic, and have racing thoughts. On the other hand, during depressive episodes, they may feel sad, hopeless, and experience a lack of interest in activities they once enjoyed.
It is important to differentiate between bipolar disorder and major depression. Major depression involves persistent feelings of sadness, hopelessness, and loss of interest in activities without the presence of manic episodes.
Seasonal affective disorder (SAD) is a type of depression that occurs at a specific time of year, usually during the winter months when there is less natural sunlight. This is different from the cyclical nature of mood swings seen in bipolar disorder.
Therefore, out of the options provided, bipolar is the mood disorder that fits the description of extreme mood swings between feeling really down and feeling really up.
