Five-year-old toddler polyuria under may be physiological factors, polyuria frequency, inflammatory frequency, neurogenic frequency, bladder capacity reduction frequency and other causes. 1. Physiological factors: such as drinking more drinks or water, mental stress, cold environment, can lead to increased urination, mostly normal phenomenon. Reduce the intake of liquid, improve the environment, adjust the mood, usually can improve the situation of frequent urination. 2. Pathologic factors: (1) polyuria frequency: increased urination, and each time the volume of urine is not less, and the total volume of urine increased. See diabetes mellitus, uremia, etc. (2) Inflammatory dysuria: frequent urination and small amount of urine each time, mostly accompanied by urinary urgency and urinary pain, such as cystitis, urethritis and so on. (3) Neurogenic urinary frequency: frequent urination and small amount of urine each time, mostly seen in central and peripheral neuropathy, such as hysteria, neurogenic bladder. (4) Reduced bladder capacity urinary frequency: such as bladder occupation, bladder tuberculosis, etc., manifested as persistent urinary frequency. If you find that your toddler is polyuric, you should seek medical advice and treatment under the guidance of a doctor. Pay attention to rest on weekdays, rationalize the diet, avoid overwork, and maintain a regular routine.