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.
Anxiety is very common, but so is heart disease. Chest pain due to anxiety is most likely caused by muscle contractions in the chest wall, where the pain tends to be localized, and is often a sharp pain that is either fleeting or interrupts a breath. The anxiety causing the chest pain will often exacerbate the condition.