What causes enlarged lymph nodes of the lungs?

Inflammation. Enlarged lymph nodes occur when the immune system is active in a part of the body (a regional factory and distibution site for inflammatory cells which travel from the bloodstream and into the lymphatic fluid). Sources of inflammation in the lungs include infection, autoimmune disorders, injury of lung tissue, chronic respiratory inflammation, and malignancies.
Monitoring Centers. Lymphatic system absorbs/carries things too big to go into the arteries/veins like bacteria eaten by white cells and digested food. Lymph nodes "taste" the lymph for anything bad like bacteria/viruses/cancers, etc. When it detects a problem, it alerts the immune system and your body reacts. They enlarge in response to the inflammation they create when they react. They shrink when all is well.

Related Questions

Does a chest x Ray reveal enlarged lymph nodes in neck area such as under the thymus gland caused by lymphoma?

The thymus gland. is not in the neck, it is in the chest(anterior mediastinum). If the lymph nodes get large enough, the chest xray will be abnormal. However, a chest xray is not a reliable way to rule out adenopathy, because the lymph nodes have to get quite bulky to show up. CT is a much more sensitive and specific test for mediastinal adenopathy. Read more...

I have a thyroid cyst, 10 enlarged lymph nodes in neck & 8 in groin, lung scarring, high k, low na, lower wbc, hypotension & a long list of symptoms?

Internist. You're not going to get a diagnosis in an on-line forum. You obviously have a complicated problem that will require a comprehensive evaluation. If your local doctor can't help, seek help at an academic center with a general internist. You're only 113 miles from des moines. Ps, hi k and low na with low BP suggests addison's disease. Read more...

I have enlarged lymph nodes in my chest ranging from 12.9-16.3mm, and what size should I be concerned or get a biopsy.

Not now. A ln must get to be 2 cm (20 mm) to be considered enlarged. Based on your medication list you are being treated for infection. Ln "enlarge" as part of the healthy response to infection. No concern here. Read more...