Hemodialysis dehydration 700ml milliliters generally means that 700ml of water has been removed from the body through hemodialysis. Hemodialysis is the main treatment for chronic kidney disease, which is to draw blood out of the body and filter out excess water and toxins (creatinine, urea, etc.) from the body through hemodialysis machines and hemodialyzers, in order to correct the disorders of water, electrolyte and acid-base balance. The amount of water removed each time is determined by the presence of edema, fluid in the cavities, high blood pressure, heart failure, and so on. If the amount of dehydration is too small, there will be edema, dyspnea, chest tightness and other manifestations of heart failure; if the amount of dehydration is too large, there will be cramps, low blood pressure, dizziness, tinnitus, hoarseness and other discomforts. The amount of dehydration in hemodialysis needs to be judged by the physician according to the patient’s condition, and should not be increased or decreased blindly by oneself.