Urine more ankle edema generally belongs to the physiological changes during pregnancy, but it can not be ruled out that it is caused by certain diseases, such as prostate hyperplasia, renal insufficiency, cardiac insufficiency and other diseases, you should consult a doctor in a timely manner to find out the cause of the disease. 1. Physiological factors: late pregnancy due to the enlargement of the uterus, compression of the bladder, increased urethral pressure, can appear frequent urination. Most women in late pregnancy, due to lower limb reflux obstruction, may appear different degrees of edema. Most of them are physiological phenomena, and the symptoms of excessive urination and ankle edema can subside on their own after delivery. 2. Pathologic factors: (1) Prostatic hyperplasia: the hyperplasia of the prostate gland can compress the urethra of the prostate or the urethral orifice of the bladder and lead to obstruction, which leads to excessive water in the body, resulting in fluid retention, thus causing frequent urination, increased nocturia, edema of the lower limbs and other symptoms. (2) renal insufficiency: patients with chronic renal insufficiency may have no obvious symptoms in the early stage, and some of them may have non-specific manifestations such as increased nocturia and lumbago, etc. With the development of the disease, it may cause water and sodium retention, which may lead to the emergence of symptoms such as edema of the lower extremities, proteinuria, and hematuria. (3) Cardiac insufficiency: in patients with cardiac insufficiency, there is an increase in nocturnal return of blood and an increase in urine output after sleep. Symptoms such as edema can also occur due to stagnant blood in the body circulation and pulmonary circulation, low ventricular pumping volume and filling function. Patients with urinary polydipsia and ankle edema should seek prompt medical attention to clarify the diagnosis and, if necessary, be treated accordingly by a doctor.