Whether 2+ occult blood in urine is serious in children should depend on the actual situation. If it is functional microscopic hematuria, it is usually less serious. If it is a disease caused by microscopic hematuria, it is more serious. 1. Functional microscopic hematuria, for example, some children after strenuous exercise, there will be a small amount of blood in the urine, there are generally no other clinical symptoms, will not cause too much impact, reasonable rest can be improved on their own. 2. Disease factors caused by microscopic hematuria, such as urinary tract infections, urinary stones, kidney disease, leukemia, hemophilia and other factors lead to, generally more serious, need timely treatment. Therefore, the presence of positive urinary occult blood, and exclude the functional microscopic hematuria, but also to do further examination, clear causes, and then targeted treatment.