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. The lymph nodes filter lymph fluid as it flows through them, trapping bacteria, viruses, and other foreign substances, which are then destroyed by special white blood cells called lymphocytes.

Lymph nodes may be found singly or in groups. And they may be as small as the head of a pin or as large as an olive. Groups of lymph nodes can be felt in the neck, groin, and underarms. Lymph nodes generally are not tender or painful. Most lymph nodes in the body cannot be felt.

Causes of swollen lymph nodes
Lymph nodes often swell in one location when a problem such as an injury, infection, or tumor develops in or near the lymph node. Which lymph nodes are swollen can help identify the problem.

-- The glands on either side of the neck, under the jaw, or behind the ears commonly swell when you have a cold or sore throat. Glands can also swell following an injury, such as a cut or bite, near the gland or when a tumor or infection occurs in the mouth, head, or neck.

-- Glands in the armpit (axillary lymph nodes) may swell from an injury or infection to the arm or hand. A rare cause of axillary swelling may be breast cancer or lymphoma.

-- 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. In rare cases, testicular cancer, lymphoma, or melanoma may cause a lump in this area.

-- Glands above the collarbone (supraclavicular lymph nodes) may swell from an infection or tumor in the areas of the lungs, breasts, neck, or abdomen.

Home Remedy for Swollen Lymph Nodes
In home remedies, the humble ginger is considered to be highly effective owing to its naturally occurring anti inflammatory properties. It is most effective when consumed directly after slicing. Clean and slice a small piece of ginger and place it at the back of the mouth. However for those who find it too pungent to consume directly, you can use it as an additive to tea and drink it.

It has been found that a slight degree of dehydration is also beneficial in treating this condition. However, do bear in mind that this does not imply a compulsory reduction of water consumption; rather it is far more sensible or advisable to bring down a drastic reduction in salt consumption. The reduction in salt consumption will lower your body's requirement for excess water which will even out the salt levels. Another effective solution is to drink a couple of cups of strong black coffee. Coffee is an efficient diuretic and will help in the reduction of excessive water in the body.

However, the use of caffeinated beverages can have its downfalls, and hence it is important to consult with your doctor on the use of caffeine as a diuretic. If the swelling still persists, it is highly recommended to seek the advice of a medical expert as it is possible that there may be a far more serious problem. An endocrinologist could help diagnose if your hormone levels are evenly balanced. The doctor may also prescribe medication to provide immediate relief from the swellings and inflammation.