Foamy urine can be caused by a number of reasons, and the further tests that need to be carried out are physical examination, laboratory tests (such as routine blood tests, biochemical tests, urinalysis), imaging tests, and pathologic tests. 1. Physical examination: if caused by disease, there may be corresponding signs. Swelling of the lower limbs may indicate kidney disease, yellowing of the skin and sclera may indicate liver and gallbladder disease, and percussion pain in the kidney area may be urinary tract infection or stones. 2. Laboratory tests: routine blood test results, if the white blood cells and neutrophils increased in bacterial infection. Elevated blood glucose can indicate diabetes mellitus, increased creatinine, decreased albumin can indicate kidney disease. Urine test leukocyte elevation can have urinary tract infection, urine ketone body positive, etc. to pay attention to diabetic ketoacidosis. 3. Imaging tests: such as abdominal ultrasound, to determine whether there is hepatobiliary and urinary tract diseases. 4. Pathological examination: patients with renal disease or suspected tumors can undergo pathological examination, such as puncture biopsy. Foamy urine, it is recommended to consult a doctor in a timely manner, under the guidance of a professional physician for further examination, to clarify the cause of the disease and then actively treat it.