The clinical so-called lymphatic diseases include three main categories with the following symptoms: 1. lymphadenitis or lymphangitis, usually secondary to bacterial and viral infections, usually with redness, swelling and pain in the head, neck or groin area, or even in the lymphatic network of the lower limbs, which can be relieved after antibiotic treatment; 2. lymphoma, usually in adolescents and children, with the main symptom of painless lymph node enlargement in the neck, which may or may not be accompanied by fever. The main symptom is painless lymph node enlargement in the neck, which may or may not be accompanied by fever, and further lymph node biopsy is needed, and chemotherapy or even radiotherapy will be used after the diagnosis is clear; 3. mesenteric lymphadenitis, which is common in adolescents and children, and develops under the age of 14, and causes mesenteric lymph node enlargement secondary to upper respiratory tract infection, and abdominal pain, which is wandering in nature, and is easily confused with acute appendicitis, and can be cured with anti-inflammatory treatment.