Nausea and weakness at the same time, often occurring in the digestive tract diseases mainly include: 1, gastrointestinal dysfunction, when the occurrence of gastrointestinal dysfunction, such as the presence of diarrhea when the loss of excessive electrolytes such as potassium ions, sodium ions, will make people nausea, weakness. 2, gastritis, acute and chronic gastritis attacks will have abdominal pain, nausea and other symptoms, while the inflammation itself is a consumptive disease, inflammatory factors will consume a lot of energy, when 3, liver disease, the liver belongs to the digestive system, when the occurrence of chronic hepatitis B and other diseases, there will be a loss of appetite, nausea and other symptoms. At the same time, chronic hepatitis B is a chronic wasting disease that requires a lot of energy and can cause weakness. 4. Patients with spleen deficiency can also have symptoms such as weakness and nausea.