Lymphadenitis is mainly characterized by swelling and pain in the lymph nodes due to inflammatory infection. However, the specific types of symptoms are different, mainly divided into non-specific lymphadenitis and specific lymphadenitis. 1. Non-specific lymphadenitis. Chronic non-specific lymphadenitis is characterized by lymph nodes that are hard to the touch, with no obvious pain, and eventually the lymph nodes may shrink or subside. Acute non-specific lymphadenitis is characterized by redness, swelling, heat and pain in the lymph nodes, the formation of large lumps, and the formation of abscesses. 2. Specific lymphadenitis. (1) Lymphadenitis of fungal infection. It is mainly manifested as local or generalized enlargement of lymph nodes. (2) EBV infection. The main manifestations are irregular fever, pharyngitis, hepatosplenomegaly, and enlarged lymph nodes. (3) Hanseniasis (cat scratch disease). The lymph nodes are enlarged, and papules and pustules may appear around them, mainly in the armpits or neck. (4) Histiocytic necrotizing lymphadenitis. It is mainly manifested by enlargement of lymph nodes in the neck, usually accompanied by recurrent fever. If you suspect lymphadenitis, you must consult a doctor to confirm the diagnosis and follow the doctor’s instructions for treatment.