Mouth ulcers fever, can be treated by local cleaning, physical cooling, medication and so on. 1. Local cleaning: oral ulcers cause fever, should pay attention to oral hygiene, pay attention to brushing teeth, gargling, if necessary, can use mouthwash. 2. Physical cooling: if the symptoms of fever, should be timely physical cooling, such as the use of ice packs, cold compresses, etc., if necessary, can also be warm water bath. 3. medication: if the physical cooling effect is not good, you can use non-steroidal anti-inflammatory drugs, such as ibuprofen, acetaminophen and other drugs, if the mouth ulcers secondary bacterial infection, you can also use antibiotics such as cefixime, amoxicillin, clindamycin and so on. If the mouth ulcers fever, you should seek medical treatment, the relevant drugs should be used under the guidance of a doctor.