Mouth sores may be accompanied by other symptoms, depending on the cause of the sores. Additional symptoms that can occur in or around the mouth in patients with mouth sores include:

• Pain or discomfort
• Reddened skin
• Itching
• Burning sensation
• Bleeding
• Flaking skin
• Bad breath
• Foul taste in the mouth
• Dry mouth
• Reduction or loss of sense of taste

In addition, a person with mouth sores may also experience difficulty chewing, swallowing, talking or breathing as a result of the sores. Additional symptoms that may occur outside the mouth area include fever, fatigue, sore throat and swollen lymph nodes.