Lymphadenitis is an infection of the lymph nodes (also called lymph glands). It is a common complication of certain bacterial infections.
The lymph system is a network of lymph nodes, lymph ducts, lymph vessels, and organs that produce and move a fluid called lymph from tissues to the bloodstream.
The lymph glands, or nodes, are small structures that filter the lymph fluid. There are many white blood cells in the lymph nodes to help fight infection.
Lymphadenitis occurs when the glands become enlarged by swelling (inflammation), often in response to bacteria, viruses, or fungi. The swollen glands are usually found near the site of an infection, tumor, or inflammation.
Lymphadenitis may occur after skin infections or other infections caused by bacteria such as Streptococcus or Staphylococcus. Sometimes it is caused by rare infections such as tuberculosis or cat scratch disease (Bartonella).
Lymph nodes may feel rubbery if an abscess has formed or they have become inflamed.
The health care provider will perform a physical exam. This includes feeling your lymph nodes and looking for signs of injury or infection around any swollen lymph nodes.
Lymphadenitis may spread within hours. Treatment should begin promptly.
Treatment may include:
Surgery may be needed to drain an abscess.
Prompt treatment with antibiotics usually leads to a complete recovery. It may take weeks, or even months, for swelling to disappear.
Call your health care provider or go to the emergency room if you have symptoms of lymphadenitis.
Good general health and hygiene are helpful in the prevention of any infection.
Lymph node infection; Lymph gland infection; Localized lymphadenopathy
Armitage JO. Approach to the patient with lymphadenopathy and splenomegaly. In: Goldman L, Schafer AI, eds. Goldman’s Cecil Medicine. 24th ed. Philadelphia, Pa: Elsevier Saunders; 2011:chap 171.
Pasternack MS, Swartz MN. Lymphadenitis and lymphangitis. In: Mandell GL, Bennett JE, Dolin R, eds. Mandell, Douglas, and Bennett’s Principles and Practice of Infectious Diseases. 7th ed. Philadelphia, Pa: Elsevier Churchill-Livingstone; 2009:chap 92.
Updated by: Jatin M. Vyas, MD, PhD, Assistant Professor in Medicine, Harvard Medical School; Assistant in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.
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