The occurrence of acute nephritis is related to streptococcal infections and is commonly seen in children. Typically, 1-3 weeks before the onset of acute nephritis, patients often have a history of infections in the throat, upper respiratory tract, or skin. Once acute nephritis occurs, the initial symptoms include hematuria, which can manifest as either gross or microscopic hematuria. There is also the appearance of edema, especially noticeable swelling of the eyelids and facial area upon waking up in the morning, and even a decrease in urine output. Additionally, patients with acute nephritis often experience increased foam in the urine, indicating the presence of proteinuria, as well as general weakness, back pain, nausea, and vomiting. After the onset of acute nephritis, some patients may experience elevated blood pressure and even transient renal failure.