Millions of dollars are spent each year in this country for headache medication. Some, in fact, go their whole lives taking some form of headache medication. There are several reasons why so many people suffer this common malady. Excess stress, as well as high blood pressure, can trigger a headache. Eating certain foods, especially processed foods with chemical additives, may trigger a headache. Low blood sugar may trigger a headache, but the most common cause of headaches is impure blood and constipation. As the waste material collects in the colon over many years, leaking its toxic poisons into the blood, and as the person consumes coffee, soda and city water, the pH of the blood becomes very acidic which irritates the nerve center of the rain, causing pain. To eliminate this situation, one would need to follow the Hsu Cleansing Program, consisting of natural foods, distilled water and ginseng tea, along with the cleansing of the bowels and liver.