I can feel a small gland on left side of my neck it does not hurt its hard and its been there for months since I notice it

Enlarged . Enlarged lymph nodes or "lymphadenopathy" are very common. Lymph nodes are part of the immune system and enlarge with white blood cells to fight off infections when they detect a foriegn substance such as a virus or bacteria. (ever notice lumps in your neck with a sore throat?) usually these nodes shrink back down to normal size a few weeks after the infection is over, but can sometimes stay enlarged. No one is quite sure why this happens, but it's usually harmless. Other illnesses such as autoimmune disease or cancer can cause enlarged lymph nodes, but often multiple nodes are involved, they can get very large, keep growing instead of shrinking and are associated with other symptoms such as fever, chills, weight loss, rash, etc. If you are concerned about this node, or notice it enlarging, becoming painful, or if you nitce more, contact your doctor.