What autoimmune disease affects lymph nodes?

Hint: Autoimmune disease is a type of disease in which the body loses its ability to distinguish between its cells and foreign molecules or foreign organisms. In this disease, the body starts to attack self-cells. This results in damage to the body and is thus called autoimmune disease.

Complete answer:
The human immune system comprises lymphoid organs, tissues, cells, and soluble molecules like antibodies. The immune system not only recognizes foreign antigens, responds to these, and remembers them but also plays an important role in allergic reactions and autoimmune diseases.
Swollen lymph nodes often occur with other symptoms that differ in severity depending on the underlying disease, infection, or condition.
Swollen lymph nodes can also be caused by autoimmune disease which is a problem of the immune system itself. The autoimmune disease that affects lymph nodes by causing inflammation or swelling in them are-
1. Juvenile rheumatoid arthritis
2. Rheumatoid arthritis is a chronic autoimmune disease that is characterized by inflammation in joints.
3. Systemic lupus erythematosus is a disorder in which the body attacks its own healthy cells and tissues.

Note:
Lymph is a type of fluid present in our body and is involved in transportation. Lymph is also known as tissue fluid. Through the pores present in the walls of blood capillaries surrounding the tissue or cells some amount of plasma, small proteins, and white blood cells escape into intercellular spaces in the tissue to form lymph or tissue fluid. Lymph absorbs digested fats from villi present in the small intestine. They carry the digested fats to other body parts and drain excess fluid from extracellular space back into the blood.