Generally speaking, children’s proteinuria is not always pathological, if it is functional children’s proteinuria, the child’s proteinuria can disappear by itself. While pathological children proteinuria will persist, nephritis is more likely. The main manifestations of proteinuria in children are: i. Tiny bubbles may be seen in the urine and can’t disappear for a long time. Second, children may have joint pain when proteinuria occurs, which is manifested by abnormal crying. Third, many children will have edema, initially in the eyelid area, and then slowly spread to the whole body. Fourth, high blood pressure and proteinuria is a vicious circle, some children with proteinuria, often accompanied by increased blood pressure. Fifth, if proteinuria persists, it has a great impact on the growth and development of children, and in the late stage, vomiting, itchy skin, and even uremia may occur. If the child has this manifestation, it is recommended to go to the regular hospital immediately, so as not to miss the best time for treatment.