Adults may have roundworms. Ascaris lumbricoides is a parasite of the human digestive tract. Ascaris lumbricoides are generally transmitted through fecal-oral transmission, and the probability of infection with Ascaris lumbricoides is higher in rural areas that are accustomed to using human feces that have not been harmlessly treated for fertilizing, or adults often eat raw mixed vegetables, melons and fruits with live eggs, which are also susceptible to infection, and thus adults may be infected with Ascaris lumbricoides. Most patients infected with roundworms may have no symptoms or mild symptoms. A small number of patients may have symptoms such as nausea, vomiting, abdominal pain, malnutrition, lack of appetite and fever. In daily life, we should develop good habits of drinking boiled water, eating cooked food, not eating unwashed fruits and vegetables, radish, etc. We should pay attention to personal hygiene and wash our hands frequently before and after meals to reduce the chance of infection. If you suspect that you are infected with roundworms, it is recommended that you go to the hospital in time to avoid delaying your condition.