Acute glomerulonephritis (acute nephritis for short), a disorder of a group of glomeruli due to different causes, is clinically marked by acute attack and hematuria accompanied by proteinuria, edema, hypertension, declined glomerular filtration rate, etc. It belongs to the category of "shuizhong" (edema) in TCM. The disease may occur in people of all age groups, but prevails in    children at the age of 3 to 12. It is seldom seen in children below the age of 2. The onset is more common in autumn and winter. Generally the prognosis is favourable and most patients may recover within half a year. For a few people, slight urinary changes may last for more than a year.