Depression (also known as major depression or major depressive disorder) is a psychiatric disorder that affects mood, behavior, ... affected relative never develop the disorder. Clinical depression Depressive disorder Major depression Major depressive disorder MDD Unipolar depression ...

... seasons. This condition is a subtype of major depressive disorder and bipolar disorder. Major depressive disorder is characterized by prolonged sadness and a general ...

... a drug called citalopram in people with major depressive disorder. This polymorphism changes a single amino acid near ... of the μ opioid receptor. People with major depressive disorder who have this polymorphism are more likely to ...