The statement that children do not need to worry about occult blood in the urine is not credible, children with occult blood in the urine should be taken seriously and actively diagnosed and treated. There are many reasons for children to have occult blood in the urine, which may be caused by physiological factors, in which case there is no need to worry; but it may also be caused by other diseases such as urinary stones and nephrotic syndrome, which need to be actively examined and treated. 1. Physiological factors: children in strenuous exercise, standing for a long time or after heavy physical labor may appear temporary occult blood in the urine, this situation is transient. Don’t worry too much, just need regular review. 2. Urinary stones: Occult blood in the urine, some of which may be accompanied by pain, lumbar soreness, or urinary frequency, urgency, dysuria and other symptoms of urinary tract infections. 3. Nephrotic syndrome: is also an important cause of children’s urinary occult blood, need to do erythrocyte aberration rate test to determine the cause. Children’s urinary occult blood has many causes, but also may be caused by urinary tract tumors, allergic purpura, systemic blood diseases, etc., the causes are very complex, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the cause of the disease, to give targeted treatment or treatment.