Two days of loose water may cause excessive loss of water, sodium and potassium ions in the body, which may lead to water and electrolyte disorders. In addition, two days of dilute water may be common in acute gastroenteritis, functional diarrhea, which needs to be clarified by routine stool tests plus routine blood tests, as well as blood tests for ion biochemistry, to clarify whether there is low potassium and low sodium plasma disorders. If the examination is clearly acute gastroenteritis, anti-infection treatment with norfloxacin and compound safranin is needed. If the diarrhea is functional, it needs to be regulated with montelukast plus rectified intestine, etc. If there is low potassium and sodium, it needs to be hospitalized for infusion to replenish water, ions and other nutrients needed by the body.