Cold and flu blisters in the mouth is a relatively common symptom, because many patients with cold and flu is caused by viral infections, easy to appear oral herpes. Cold patients with decreased body resistance, blisters can be seen in the mouth caused by herpes simplex virus infection, but also because of viral stimulation of oropharyngeal lymphoid follicular hyperplasia ulceration occurs ulcers, and should pay attention to drink more warm water. Generally with the recovery of the cold, the condition can be improved. In addition, cold patients may be due to the body inflammation caused by “fire”, pay attention to light diet, drink more water, eat a little bit of fresh fruits and vegetables, will help the recovery of the condition.