As we mentioned earlier, lupus is a case of immune system over activity, where the body begins to attack and damage its own tissue. As is often the case, the result of this can be extreme inflammation to different parts of the body, mainly organs.
This symptom can manifest itself as pain as all the organs under your breast plate and in your abdominal area can be affected, often swelling, and causing a build of pressure. The lungs, kidneys, spleen, and even the heart are all susceptible to lupus’s impact.
Lupus can cause an inflammation of the myocardium, which is the muscle's tissue surrounding the heart. When this part becomes infected or inflamed, it can result in chest pain, and unexplained rapid or irregular heartbeat.