The common causes of thirst in children are physiologic and pathologic. Pathological causes are commonly dehydration, diabetes, uremia. 1. Physiological causes: hot weather sweating, can lead to children thirsty, eat too sweet and spicy too salty, can also lead to children thirsty. 2. Pathological causes: vomiting, diarrhea leads to dehydration, the child can show symptoms of thirst, low urine, dry skin. Diabetes mellitus, because of the increase in blood sugar will show symptoms of excessive drinking, excessive urination, excessive food and weight loss. Children with urolithiasis urinate a lot and lose water rapidly from the body, and children may also show symptoms of thirst. Children’s thirst, there may be other reasons, it is recommended to go to the hospital in time, complete the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.