Mood are a category of mental health conditions affecting a person's emotional state, leading to periods of extreme sadness, elevated mood, or a combination of both. These disorders include conditions such as depression, bipolar disorder, and cyclothymia, each marked by different patterns and intensity of mood changes. Mood disorders can significantly affect daily functioning, relationships, and overall quality of life. (They often require a combination of medication, psychotherapy, and lifestyle changes for effective management).

Depression is a mood disorder characterized by persistent feelings of sadness, hopelessness, and a lack of interest or pleasure in activities. It can affect sleep, appetite, energy levels, concentration, significantly impairing daily life.