Small children urinate frequently always urinate a little consider with cold stimulation, mental tension and other physiological factors, but also consider with cystitis, urethritis, urethritis and so on. 1. Physiological factors: when the child by the cold stimulation, mental overstress, can be manifested in frequent urination, always urinate a little phenomenon. 2. Cystitis: most of them are caused by bacterial infections, and decreased autoimmunity and obstruction of urine flow are the triggering factors. Cystitis patients will appear frequent urination, urinary urgency, urinary pain, pain in the lower abdomen and other symptoms, can be manifested as a small child urinate frequently, always urinate a little. 3. Urethritis: related to gonococcus, chlamydia trachomatis, mycoplasma infection. The common symptoms of patients have urethral stinging, frequent urination, urinary urgency, urinary pain, etc., can be manifested as frequent urination, always urinate a little. 4. Ureaplasia: Ureaplasia can cause some small children to urinate frequently, always urinate a little. Disease is mainly related to arginine pressin deficiency, renal insensitivity to arginine pressin, etc. Children are also prone to extreme thirst, irritability, nausea and vomiting and other symptoms. There are many reasons that cause small children to urinate frequently and always urinate a little, such as pyelonephritis, urinary tract stones and so on. Parents are advised to take their children to the doctor for examination in time so as to clarify the disease and then follow the doctor’s instructions for treatment.