The reasons for the appearance of foamy urine in nephritis include the presence of excessive protein in the urine, increased urinary sugar due to tubular damage, and the presence of excessive ammonia in the urine. Its appearance is manifested as cloudy urine, dark yellow color and more foam. Foam can also appear in normal people’s urine, but the foam in the urine of patients with nephritis lasts longer. Once patients have foamy urine, it is recommended to go to the hospital for urine routine examination in time. If the patient has hematuria at the same time, the condition of nephritis is more serious and needs to be taken seriously.