Frequent mouth ulcers can be a symptom due to immune function problems, sleep abnormalities, and vitamin deficiencies. It is important to seek medical attention in a timely manner.

1. Immune function problems: when the patient's immune function hyper or low immunity can lead to mouth ulcers, generally more common in low people, will make the mouth breeding a lot of bacteria, triggering ulcers. Patients can improve their immunity through moderate exercise and enhanced nutrition.

2. Sleep abnormality: When patients often stay up late and have poor sleep quality, it can also lead to mouth ulcers. Patients should maintain good habits, optimistic and happy, regular work and rest.

3. Vitamin deficiency: if the patient lacks vitamins, iron and zinc, it is easy to have mouth ulcers.

4. Poor oral hygiene, anemia and so on may also cause.