Complications of chronic renal insufficiency include hypertension, heart failure, water-electrolyte imbalance, anemia, renal bone disease and digestive system discomfort. 1. Hypertension: patients with renal insufficiency have sodium and water retention in the body, which increases blood pressure and leads to dizziness and headache, etc. Heart failure: the volume load of the body is too high, which leads to heart failure. 2. Heart failure: the body volume overload, high toxin level damages the heart muscle, dyspnea, chest tightness, shortness of breath and other symptoms of heart failure. 3. Water-electrolyte balance disorders: electrolyte disorders are common, such as hyperkalemia, metabolic acidosis, hypocalcemia and hyperphosphatemia. 4. Anemia: the kidney secretes less erythropoietin, and the patients have renal anemia. 5. Nephrogenic bone disease: calcium and phosphorus metabolism in the patient’s body is disturbed, and with the progress of the disease, the patient’s skeletal system is damaged, which is manifested as bone fracture, bone pain, and so on. 6. Digestive discomfort: the toxins in the body can not be discharged through the kidneys, the toxins will stimulate the gastrointestinal tract, loss of appetite, nausea, vomiting and other symptoms. It is recommended that patients with renal insufficiency should consult the hospital in time and actively cooperate with doctors to avoid adverse consequences.