When used as an ice pack, the Pack reduces muscle spasms, pain, swelling and/or bruising after any type of trauma, dental procedure or insect bite. It is best used in the first 48 hours when applied upon the affected area to reduce swelling around the injury. Ice treatment may also be used for chronic conditions before activity. The Pack is excellent for sore, stiff, nagging muscles, joint pain, chronic injuries or injuries with no inflammation. It can help to reduce muscle spasms, alleviate pain, elevate blood flow, and boost metabolism. Avoid the use of heat treatment if the injury shows signs of swelling as the application of heat can promote unwanted blood flow to the injured area.