Weakness, dizziness, lack of energy, nausea, usually have the following four causes: First, the most common cause is the initial stage of the cold, whether it is a bacterial cold, a viral cold, or an atypical pathogen, when the body in vivo immune response will produce an immune response, so the body will produce a response to exclude the virus, which will produce weakness, dizziness, lack of energy accompanied by nausea. Second, the most typical diseases such as digestive system diseases, acute gastroenteritis will appear in the early stage of nausea, weakness, dizziness, headache. Third, such as endocrinology diseases often have hypoglycemic coma, there will be a transient weakness, dizziness, nausea, and no energy in the early stage of hypoglycemia. Fourth, the most common circulatory system disease, myocardial ischemia caused by insufficient blood supply to the coronary arteries, when there will be nausea, weakness, lack of energy, dizziness.