Patients with acute nephritis usually have hematuria as their main symptom. Initially, the condition presents as gross hematuria, but within 1-2 days, the patient transitions to microscopic hematuria, and the gross hematuria disappears. Patients may also experience edema, particularly noticeable in the eyelids and facial area upon waking up in the morning, along with varying degrees of increased urine protein. Typically, acute nephritis patients may also experience nausea, vomiting, abdominal distension, and discomfort in the lower back, but not back pain per se, as back pain is not a symptom of acute nephritis. However, if a patient with acute nephritis does develop back pain, it is crucial to rule out other diseases, such as kidney stones, ureteral stones, acute pyelonephritis, and acute renal infarction, all of which can cause sudden back pain in patients with acute nephritis. Back pain should be taken seriously, and appropriate exams, such as an immediate ultrasound, should be conducted.