The most common type of acute nephritis is called “acute glomerulonephritis after streptococcal infection”, often referred to as “acute nephritis”, the cause of which has not been fully understood. It is generally believed to be closely related to streptococcal infections. Streptococcal infections often cause tonsillitis, skin infections (impetigo) and so on. However, the symptoms of acute nephritis do not appear at the time of tonsillitis and skin infections, but often some time after the disease has healed. There is usually an incubation period of 7 to 20 days between the two, with a longer incubation period after skin infections (18 to 21 days on average). The main reason why streptococcal infection does not develop immediately is that acute nephritis is not the result of direct infection of streptococci to the kidneys, but the bacterial components of streptococci bind to antibodies in the blood to form immune complexes and deposit in the kidneys causing inflammation and causing disease. The production of antibodies takes about 1 to 3 weeks, and this time forms an incubation period of 7 to 20 days between streptococcal infection and acute nephritis. Therefore, you should routinely check your urine after 1 to 3 weeks after acute tonsillitis or sepsis has healed, observe the color of the urine (look for thick tea-colored, washboard-like urine), and see if your eyelids are puffy in the morning, so that you can detect and treat acute nephritis in a timely manner.