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.
Sore Chest Muscles. Chest pain due to sore muscles is a pretty common phenomenon in athletes and older folks. Although not a life-threatening situation, sore chest muscles can be debilitating and can cause severe pain and discomfort. Sharp, stabbing pain in chest does not need to be an indicator of heart attack.