They may be consumed up to the use by date. Unopened deli meats generally keep for two weeks. However, once the package is opened, the use by date is meaningless; the meat should be consumed within 3-5 days. This is because anti-oxidative gases that preserve pre-packaged deli meats escape from the packaging once it is opened. Unopened packaged deli meat can be frozen for one to two months.
Chest soreness that is caused by working out used to be attributed largely to the buildup of lactic acid, which is a waste product created by the muscles when strained.
What causes chest pain? Chest pain can be caused by a range of conditions, from not serious to life-threatening. It may be caused by a heart attack or a blood clot in your lungs. Sometimes chest pain or pressure is caused by poor blood flow to your heart (angina). Infection, inflammation, or a fracture in the bones or cartilage in your chest can cause pain or discomfort. Chest pain can also be a symptom of a digestive problem, such as acid reflux or a stomach ulcer.