when the inhaled tuberculosis bacteria enter the lungs they can multiply and cause a local lung infection (pneumonia). the local lymph nodes associated with the lungs may also become involved with the infection and usually become enlarged. the hilar lymph nodes (the lymph nodes adjacent to the heart in the central part of the chest) are often involved. in addition tb can spread to other parts of the body. the body's immune (defense) system however can fight off the infection and stop the bacteria from spreading. the immune system does so ultimately by forming scar tissue around the tb bacteria and isolating it from the rest of the body. tuberculosis that occurs after initial exposure to the bacteria is often referred to as primary tb. if the body is able to form scar tissue (fibrosis) around the tb bacteria then the infection is contained in an inactive state. such an individual typically has no symptoms and cannot spread tb to other people. the scar tissue and lymph nodes may eventually harden like stone due to the process of calcification of the scars (deposition of calcium from the bloodstream in the scar tissue). these scars often appear on x-rays and imaging studies like round marbles and are referred to as a granuloma. if these scars do not show any evidence of calcium on x-ray they can be difficult to distinguish from cancer. sometimes however the body's immune system becomes weakened and the tb bacteria break through the scar tissue and can cause active disease referred to as reactivation tuberculosis or secondary tb. for example the immune system can be weakened by old age the development of another infection or a cancer or certain medications such as cortisone anticancer drugs or medications used to treat arthritis or inflammatory bowel disease. the breakthrough of bacteria can result in a recurrence of the pneumonia and a spread of tb to other locations in the body. the kidneys bone and lining of the brain and spinal cord (meninges) are the most common sites affected by the spread of tb beyond the lungs.
what happens to the body when a person gets tuberculosis?