It is possible for oral ulcers to cause lymphatic inflammation, or inflammation of the lymph nodes, which usually occurs in patients with severe recurrent aphthous ulcers or herpes-like recurrent aphthous ulcers, as follows. 1. Severe recurrent aphthous ulcers: the ulcers are large and deep, usually 1~2, with severe pain and long duration, and in severe cases, they may cause large scars or tissue defects. It often triggers systemic symptoms, such as low-grade fever and fatigue, and lymph node swelling and pain in the area around the ulcer. 2. Herpes-like recurrent aphthous ulcers: ulcers are small and numerous, like “stars” distributed in the oral mucosa, severe pain, can be accompanied by headache, low-grade fever, general malaise, localized lymph node swelling and pain. Oral ulcers should go to the regular hospital in time.