According to the 1996 National Health Interview Survey, about 3 million people in the United States have frequent constipation. Those reporting constipation most often are women and adults age 65 and over. Pregnant women may have constipation, and it is a common problem following childbirth or surgery. Constipation is one of the most common gastrointestinal complaints in the United States, resulting in about 2 million doctor visits annually. However, most people treat themselves without seeking medical help, as is evident from the millions of dollars Americans spend on laxatives each year.