Increased serum potassium can be caused by the following diseases: firstly, kidney diseases, such as acute and chronic renal failure, hyperalgesia, and metabolic acidosis due to renal failure, which can cause a decrease in urinary excretion and lead to the accumulation of potassium in the body and hyperkalemia. The second point is acute dehydration, which is caused by various reasons, especially dehydration of the digestive tract, which can lead to a concentration of potassium and an increase in blood potassium. The third point is common in digestive diseases such as obstruction of the digestive tract, gastritis, gastric ulcer, esophageal stricture, and ulcerative enteritis, which can cause a pathological increase in blood potassium. The fourth point is that large traumatic injuries, mostly burns, muscle trauma, serious infections and surgery, can cause an increase in blood potassium.