5-year-old children always licking lips, may be physiological factors, bad habits, lipitis and other factors. 1. Physiological factors: children drink too little water, may lead to lips too dry, will often lick lips, should give children more water, improve the indoor temperature, indoor not too dry. 2. Bad habits: 5-year-old children are strong imitators, if they deliberately imitate others, they will often lick their lips, parents should correct their children’s bad habits. 3. Lipitis: may be related to long-term chronic irritation, bad habits, genetics and other factors, may make the lip area dry, itchy, it will lead to the child is always licking the lips, also accompanied by pain, swelling and other symptoms. 5-year-old children always licking lips, and accompanied by other abnormal performance, should be alert for disease factors, parents are advised to take their children to the doctor for examination and treatment.