Most of the foam in the urine of boys is normal, but it may also be caused by urinary tract infection, acute glomerulonephritis and so on. 1. Normal: If the foam lasts for a relatively short period of time, the number is small, and the size is different, usually belongs to the normal physiological situation, as long as the urine is concentrated due to drinking too little water and sweating too much, which leads to the phenomenon of foamy urine. 2. Urinary tract infection: If infected by bacteria, mycoplasma, chlamydia, viruses and other infections, the child will have urine foamy situation, and at the same time and fever, urinary urgency, urinary pain and other symptoms. 3. Acute glomerulonephritis: boys urine foam may be due to acute glomerulonephritis, usually caused by bacteria, mainly manifested as proteinuria, edema, hematuria and other symptoms. It is recommended that parents promptly lead the patient to the hospital, under the guidance of the doctor, the relevant examination, according to the patient’s specific examination results, to take targeted treatment.