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.
Chest pain is also caused by irritation and swelling of the heart (myocarditis) or its outer covering (pericarditis). This inflammation can be caused by an infection or happen after heart attack or heart surgery. Pain from myocarditis or pericarditis is usually is sharp and in the center of the chest. It tends to get worse when you breathe, lie down, cough or swallow. Sitting or leaning forward sometimes reduces the pain.