Parasites are mostly transmitted orally, which is caused by poor hygiene, dirty hands and eating, and then the parasites are eaten into the stomach, resulting in parasitic infection. If you have good hygiene and your stomach doesn’t hurt and you don’t think there are worms in the abdominal cavity, it’s okay not to take wormer. If you suspect that there are worms in your stomach, if you have frequent stomach pains, if you bite your teeth when you sleep at night, and if you find white worms or eggs in your stool, you should take wormer. Common parasitic infections are roundworms or pinworms, which manifest as pain in the abdomen and itching in the anus during sleep at night, because the female worms go to the anus to lay eggs. For example, roundworms can easily form obstruction, bleeding and infection in the biliary tract, and after the accumulation of roundworms in the small intestine, serious complications such as obstruction and perforation of the small intestine can occur.