Symptoms such as depression, diarrhea, bloating, anxiety, insomnia, migraines, and mood swings are often blamed on PMS. That blame is inaccurate. These symptoms, like the supposed symptoms of menopause, are actually from underlying health conditions such as a sensitive central nervous system, IBS, food allergies, or heavy metal toxicity. They make themselves known at this particular time in a woman’s cycle because the menstruation process takes up 80 percent of her body’s reserves. The 20 percent left over cannot manage the health conditions that the immune system normally keeps at bay.