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Lymphadenitis
Lymph node infection; Lymph gland infection; Localized lymphadenopathy
Lymphadenitis is an infection of the lymph nodes (also called lymph glands). It is a common complication of certain bacterial infections.
Lymph nodes
Lymph nodes are present throughout your body. They are an important part of your immune system. Lymph nodes help your body recognize and fight germ...
Causes
The lymph system (lymphatics) 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.
Lymph system
The lymph system is a network of organs, lymph nodes, lymph ducts, and lymph vessels that make and move lymph from tissues to the bloodstream. The l...
The lymph glands, or lymph 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).
Cat scratch disease
Cat-scratch disease is an infection with bartonella bacteria that is believed to be transmitted by cat scratches, cat bites, or flea bites.
Symptoms
Symptoms may include:
- Red, tender skin over lymph node
- Swollen, tender, or hard lymph nodes
Lymph nodes may feel rubbery if an abscess (pocket of pus) has formed or they have become inflamed.
Abscess
An abscess is a collection of pus in any part of the body. In most cases, the area around an abscess is swollen and inflamed.
Exams and Tests
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.
A biopsy and culture of the affected area or node may reveal the cause of the inflammation. Blood cultures may reveal spread of infection to the bloodstream.
Biopsy
A biopsy is the removal of a small piece of tissue for laboratory examination.
Blood cultures
A blood culture is a laboratory test to check for bacteria or other germs in a blood sample.
Treatment
Lymphadenitis may spread within hours. Treatment should begin right away.
Treatment may include:
- Antibiotics to treat any infection
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Analgesics
(painkillers) to control pain
Analgesics
Over-the-counter (OTC) pain relievers can help relieve pain or lower a fever. Over-the-counter means you can buy these medicines without a prescript...
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- Cool compresses to reduce inflammation and pain
Surgery may be needed to drain an abscess.
Outlook (Prognosis)
Prompt treatment with antibiotics usually leads to a complete recovery. It may take weeks, or even months, for swelling to disappear.
Possible Complications
Untreated lymphadenitis may lead to:
- Abscess formation
- Cellulitis (a skin infection)
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Fistulas
(seen in lymphadenitis that is due to tuberculosis)
Fistulas
A fistula is an abnormal connection between 2 body parts, such as an organ or blood vessel and another structure. Fistulas are usually the result of...
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Sepsis
(bloodstream infection)
Sepsis
Sepsis is an illness in which the body has a severe, inflammatory response to bacteria or other germs.
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When to Contact a Medical Professional
Call your provider or go to the emergency room if you have symptoms of lymphadenitis.
Prevention
Good general health and hygiene are helpful in the prevention of any infection.
References
Pasternack MS, Swartz MN, Morton N. Lymphadenitis and lymphangitis. In: Bennett JE, Dolin R, Blaser MJ, eds. Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases . 8th ed. Philadelphia, PA: Elsevier Saunders; 2015:chap 97.
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Lymphatic system - illustration
The lymphatic system filters fluid from around cells. It is an important part of the immune system. When people refer to swollen glands in the neck, they are usually referring to swollen lymph nodes. Common areas where lymph nodes can be easily felt, especially if they are enlarged, are: the groin, armpits (axilla), above the clavicle (supraclavicular), in the neck (cervical), and the back of the head just above hairline (occipital).
Lymphatic system
illustration
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Immune system structures - illustration
The immune system protects the body from potentially harmful substances. The inflammatory response (inflammation) is part of innate immunity. It occurs when tissues are injured by bacteria, trauma, toxins, heat or any other cause.
Immune system structures
illustration
-
Lymphatic system - illustration
The lymphatic system filters fluid from around cells. It is an important part of the immune system. When people refer to swollen glands in the neck, they are usually referring to swollen lymph nodes. Common areas where lymph nodes can be easily felt, especially if they are enlarged, are: the groin, armpits (axilla), above the clavicle (supraclavicular), in the neck (cervical), and the back of the head just above hairline (occipital).
Lymphatic system
illustration
-
Immune system structures - illustration
The immune system protects the body from potentially harmful substances. The inflammatory response (inflammation) is part of innate immunity. It occurs when tissues are injured by bacteria, trauma, toxins, heat or any other cause.
Immune system structures
illustration
Review Date: 5/1/2015
Reviewed 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, Boston, MA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.
