Polyuria refers to a normal person who urinates more than 2500ml a day. Polyuria is divided into physiological and pathological, and the causes are different in different cases. Physiological polyuria is mainly caused by drinking too much water, food containing more water, eating watermelon, drinking beer or congenital physiological causes of a small bladder capacity may lead to polyuria. Physiological polyuria does not require much intervention, and the symptoms of polyuria will disappear once the cause disappears. Pathological causes of polyuria may include: 1, lower urinary tract infection, mostly in women, women’s urinary tract is short and easy to be infected by bacteria, usually must pay attention to cleanliness and hygiene, if there is polyuria and painful urination, go to the hospital in time for treatment. 2, glomerulonephritis, acute and chronic renal failure, etc. may cause polyuria, the early stage is less urine, when the appearance of polyuria, we should pay attention to. 3, bladder inflammation, long-term holding urine or stones may cause bladder inflammation, causing polyuria. 4, diabetes, diabetic patients will appear polyuria as well as proteinuria in the early stage. There are many causes of polyuria, generally related to the kidneys, find yourself in the situation of polyuria, you must go to the hospital in time to avoid causing serious kidney disease.