Pericarditis is an inflammation of the pericardium, the fibrous sac surrounding the heart. Both chronic and acute pericarditis are possibilities, and in each case the inflammation is likely to result in feelings of chest pain.
Low-grade fever, difficulty breathing while lying down, edema in the stomach or legs, and a general sense of being ill are other symptoms of pericarditis, which is often caused by a virus but frequently goes unexplained. These are signs of a serious condition that requires a doctor's medical consultation.
Anti-inflammatory foods and supplements are a good first step to address pericarditis, as are systemic antivirals such as garlic. However, be certain that a chosen natural remedy doesn't conflict with any heart medications prescribed by your doctor.