Protein in the urine may be caused by physiological factors, and may also be related to urinary tract infections and kidney disease. 1. Physiological factors: strenuous exercise and consume a lot of high-protein food and other physiological factors, can lead to the presence of a small amount of protein in the urine, but there is no other abnormalities, after eliminating the triggers can usually return to normal. 2. Urinary tract infections: such as cystitis, pyelonephritis, etc., may be related to poor hygiene, resulting in the presence of protein in the urine, accompanied by frequent urination, urinary urgency, urinary pain and other symptoms, and urine leukocytes, red blood cell content will be significantly higher. 3. Kidney diseases: such as glomerulonephritis, diabetic nephropathy, etc., may lead to abnormal function of the kidneys, protein into the urine, so that the presence of protein in the urine, accompanied by swelling of the lower limbs and eyelids and other abnormal manifestations. If you have protein in your urine, it is recommended that you go to the hospital in time for treatment under the guidance of your physician to avoid delaying your condition.