Exercise is pale and weak stomach upset may be caused by physiological factors such as strenuous exercise, may also be caused by chronic gastritis, gastric ulcer and other pathological factors. 1. Physiological factors: such as strenuous exercise, can cause skeletal muscle vasodilatation, blood flow increases, thus reducing the blood flow of the digestive system, resulting in gastric discomfort; peripheral vasodilatation, which can cause symptoms such as pallor, sweating and so on. 2. Pathologic factors: (1) chronic gastritis: refers to is Helicobacter pylori infection, alcohol, mental stress and other factors of long-term chronic stimulation, causing gastric mucosa congestion, edema and other inflammatory changes. Exercise can cause sympathetic nerve excitation, resulting in decreased blood flow in the digestive system, ischemic stimulation of the gastric mucosa nausea, vomiting and other discomforts. (2) Gastric ulcer: in the spirit, psychology, environment, Helicobacter pylori and other irritation caused by the gastric mucosa localized ulcers, can cause the decline in digestive function, stomach pain, nausea and other symptoms. When the exercise can cause or aggravate the feeling of stomach discomfort, causing pale skin, fatigue and other manifestations. Exercise pale and weak stomach may also be hyperthyroidism and other causes, it is recommended to consult a doctor to clarify the diagnosis, under the guidance of the doctor for targeted treatment.