Premenstrual disorders are characterized by negative mood, behavioral, and physical symptoms that occur consistently for several days to two weeks before menses, that can disrupt normal functioning, and that subside during the postmenstrual phase of the cycle. Marked irritability, marked depressed mood, marked anxiety, overeating of specific food cravings, mood swings, lack of energy, and pain are among the most common symptoms of moderate to severe premenstrual disorders.