Children’s mouth long bubble causes are as follows: 1, children’s mouth long bubble is due to fire, because the child drink less water or no good rest may cause fire, resulting in the mouth long bubble. At this time it is recommended to go to the child to drink more water, eat more vegetables and fruits to clear heat and reduce fire. 2, oral long blister is due to vitamin deficiency, if the lack of vitamin B, vitamin C, especially vitamin B2, vitamin B6, is more likely to lead to problems in the oral cavity. Because if the lack of vitamin C, oral resistance will be reduced, vitamin B2 and vitamin B6 deficiency will lead to oral mucosa lesions, such as ulcers or long blisters may occur. In this case it is recommended to give the child more vitamin complex, long blisters will soon be able to heal.