Swollen lymph nodes are caused by:Ear infection.
The most common cause of swollen lymph nodes is an infection, particularly a viral infection, such as the common cold. However, there are other types of infections, including parasitic and bacterial, and other possible causes of swollen lymph nodes. More serious conditions, such as immune system disorders or cancers, can cause the lymph nodes throughout the body to swell. Immune system disorders that cause the lymph nodes to swell include lupus and rheumatoid arthritis. 1 A rare cause of axillary swelling may be breast cancer or lymphoma. 2  The lymph nodes in the groin (femoral or inguinal lymph nodes) may swell from an injury or infection in the foot, leg, groin, or genitals. Lymph nodes are very small clusters of immune cells that function as part of the body’s immune system. There are more than 600 lymph nodes throughout the body, but the ones most frequently enlarged or swollen are the lymph nodes in the neck, under the chin, in the armpits, and in the groin. Small, bean-shaped structures called lymph nodes are found near the lymphatic vessels. There are about 600 lymph nodes throughout the body, some in deep tissues and others closer to the skin. Clusters of nodes are found in the neck, armpits, abdomen and groin. Other nodes are found in the chest, arms, and legs. Lymph nodes become swollen in response to illness, infection, or stress. Swollen lymph nodes are one sign that your lymphatic system is working to rid your body of the responsible agents. Swollen lymph glands in the head and neck are normally caused by illnesses such as: 1  ear infection. Lymph nodes are small, bean-shaped glands throughout the body. They are part of the lymph system, which carries fluid (lymph fluid), nutrients, and waste material between the body tissues and the bloodstream. The lymph system is an important part of the immune system, the body's defense system against disease. Lymphoma, which is a cancer of the lymphatic system, also causes the lymph nodes to swell. Some medications and allergic reactions to medications can cause the lymph nodes to swell. Anti-seizure and antimalarial drugs can also caus 1 Glands in the armpit (axillary lymph nodes) may swell from an injury or infection to the arm or hand. 2  A rare cause of axillary swelling may be breast cancer or lymphoma. 3  The lymph nodes in the groin (femoral or inguinal lymph nodes) may swell from an injury or infection in the foot, leg, groin, or genitals.
http://www.mayoclinic.org/diseases-conditions/swollen-lymph-nodes/basics/causes/CON-20029652 http://www.healthline.com/health/swollen-lymph-nodes http://www.webmd.com/a-to-z-guides/swollen-lymph-nodes-topic-overview?wwparam=1307921683 http://www.healthgrades.com/symptoms/swollen-neck-lymph-nodes http://my.clevelandclinic.org/health/diseases_conditions/hic-swollen-lymph-nodes http://www.healthline.com/health/swollen-lymph-nodes http://www.webmd.com/a-to-z-guides/swollen-lymph-nodes-topic-overview?wwparam=1307921683 http://www.healthline.com/health/swollen-lymph-nodes http://www.webmd.com/a-to-z-guides/swollen-lymph-nodes-topic-overview?wwparam=1307921683
what causes nodes