A few people may experience headache, nausea and stomach pain after taking Intestinal Wormer, but these symptoms do not need to be treated and will go away on their own after some time. Intestinal wormer is an anthelmintic drug, which has the effect of removing parasites from the body. After taking intestinal wormer, the parasites will move around in the body, and some of them may even twist and form a group, so some people will have abdominal pain. Some people have more parasites in their bodies, and they will gather in a certain part of the body in clumps. After taking intestinal worm cleaning, the intestinal tract may become blocked due to the gathering of worms in clumps, so symptoms such as abdominal distension and abdominal pain may occur. The pain in the stomach after taking intestinal worms will only exist for a period of time and will be eliminated naturally after a period of time without treatment. However, in some people, the pain is more severe and prolonged, which may be caused by the parasite entering the bile duct through the papilla of the duodenum. In such cases, it is necessary to seek medical attention and treatment in a timely manner.