After running 800 meters nausea, vomiting and other symptoms, may be due to a short period of strenuous activity, hypoxia, hypoglycemic reaction, gastrointestinal discomfort, etc., can be relieved by resting and drinking water, etc., if the combination of abdominal pain, vomiting, etc., there may be intestinal torsion, need to consult a doctor. 1. Short-term hypoxia, hypoglycemia, gastrointestinal discomfort: short-term strenuous exercise will cause a rapid increase in muscle and other tissues oxygen consumption, energy consumption, vibration stimulation of the intestinal tract, which may lead to hypoxia, hypoglycemia, gastrointestinal discomfort, causing nausea, vomiting and other symptoms. This can be relieved by immediately stopping the activity, walking slowly, drinking warm water, keeping warm, and supplementing with sugar or sugary drinks. If the symptoms continue to be unrelieved, it is recommended to go to the hospital in time. 2. Intestinal torsion: Strenuous exercise after a full meal may lead to mechanical torsion of the intestines, which may be manifested by vomiting and severe abdominal pain. It is necessary to go to the hospital immediately for surgical intervention. Severe cases need active medical treatment.