Symptoms of chronic nephritis include proteinuria, hematuria, edema and so on; chronic nephritis can be infected, renal insufficiency, cardiorespiratory decline and other hazards. 1. Symptoms of chronic nephritis: patients with chronic nephritis can have microscopic hematuria and hematuria of the naked eye, which is due to the damage of renal cells caused by inflammation, resulting in bleeding; proteinuria will also occur, and the urine of patients will show an increase in foaming; due to the accumulation of water in the body will result in oedema, especially in the eyelids and the facial edema and so on. 2. Chronic nephritis can cause the following harm. (1) Infection: Due to the loss of proteinuria, plasma albumin decreases, the body’s immunity decreases, and it is easy to combine with various infections, such as pneumonia and urinary tract infections. (2) renal insufficiency: chronic nephritis, the condition is prolonged and slowly progressing, there can be different degrees of renal function damage, some patients will eventually develop to end-stage renal failure. Clinical manifestations can be anemia, electrolyte disorders, metabolic acidosis, nausea, vomiting and so on. (3) Decline in cardiopulmonary function: edema can burden the heart and lungs, which in turn causes heart failure or pulmonary edema, and when the condition is serious, it can lead to death. Patients with chronic nephritis need to go to regular hospitals for medical treatment in time to slow down the progress of the disease.