Frequent urination in a three-year-old boy can be treated by controlling blood sugar, anti-infection treatment and surgery. A little bit at a time, it may be caused by physiological factors, polyuria frequency, inflammatory frequency, neurogenic frequency, reduced bladder capacity frequency, periurethral lesions and so on. 1. Physiological factors: for example, 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 urine volume is not less, and the total urine volume increases. Seen in diabetes mellitus, etc., should actively control blood sugar, such as the use of metformin. (2) Inflammatory dysuria: frequent urination and small amount of urine each time, mostly accompanied by urinary urgency, urinary pain, such as cystitis. It should be actively anti-infection treatment, such as using amoxicillin. (3) Reduced bladder capacity urinary frequency: such as bladder occupation, manifested as persistent urinary frequency. Surgical treatment is usually required. All the above drugs need to pay attention to the side effects and adverse reactions of the drugs, please use the above drugs under the guidance of a doctor. There are many causes of frequent urination in a three-year-old boy, and the treatment options are completely different. When using medication, it is recommended to consult a doctor in time to identify the cause and treat it actively.