The manifestations of having roundworms in the stomach are severe abdominal pain, fever and itching of the skin, which are caused by the pathogenic factors of roundworms. 1. Intense abdominal pain: when the patient is infected with roundworms, due to the intestinal roundworms have the habit of drilling holes and also prefer alkaline environment. Therefore, when the patient’s gastrointestinal dysfunction, hunger, intestinal environment changes, roundworms can be active in the intestinal tract. As a result, the patient will have a sudden sharp colic like drilling under the sword, with paroxysmal aggravation of the symptoms. 2. Biliary colic and fever: Ascaris lumbricoides can burrow into the biliary tract and cause spasm of the sphincter of oddi through mechanical stimulation, leading to the symptoms of biliary colic in patients. Ascaris lumbricoides can bring intestinal bacteria into the biliary tract, and the bacterial antigen acts as an exogenous thermogenic source, stimulating the hypothalamic thermoregulatory center, thus leading to the symptoms of fever. 3. Jaundice and itchy skin: Ascaris lumbricoides dies when it burrows into the biliary tract, and its remains may lead to the occurrence of gallstones. The gallstones block the neck of the gallbladder, which leads to the obstruction of bile excretion, and the bilirubin in the bile passes through the bloodstream and combines with the mucous membrane of the skin and the mucous membrane of the sclera, resulting in jaundice. This causes the patient to develop itchy skin. If there are many other manifestations of roundworms in the patient’s stomach, he should go to the hospital in time, complete the relevant examinations, clarify the cause of the disease, and follow the doctor’s instructions for treatment.