When it comes to "edema", people often think about whether they have "lumbar spondylosis". Kidney is an important organ for normal people to excrete water. Once the kidney gets sick, the blood flow rate into the kidney slows down, or the area filtered out by the kidney decreases, so the urine volume decreases and edema appears all over the body. But besides kidney disease, there are other reasons that can also cause systemic edema. (2) Severe malnutrition When severe malnutrition occurs, the concentration of protein in the plasma decreases, and a certain osmotic pressure cannot be maintained in the plasma, and water in the blood flows from blood vessels to tissues, which may also cause systemic edema. (3) Excessive intravenous fluid replacement is caused by improper treatment. Generally, edema can gradually subside after stopping intravenous infusion.