Women commonly experience premenstrual symptoms that center on emotional and physical complaints, but they are typically mild. A few experience these symptoms in greater numbers and with increased severity, to the extent that they are associated with obvious social and occupational impairment. PMDD is defined in terms of various mood-related symptoms that occur repeatedly during the premenstrual phase of the cycle and are then diminished at the onset or shortly after menses. Symptoms include mood lability, irritability, dysphoria, and anxiety as well as cognitive (difficulty concentrating, feeling of being overwhelmed or out of control), and somatic symptoms (e.g., lethargy, changes in appetite, sleep problems, joint or muscle pain, a sensation of bloating, etc.)