Hot and cold packs should be present in every house and also present in first aid kit. Hot therapy can increase blood flow and help restore movement to injured tissue. Warmth can also reduce joint stiffness, pain, and muscle spasms. As with cold packs and hot packs have a role in easing pain from both acute and chronic injuries, such as sprains, strains, muscle spasms, whiplash, and arthritis. It is one of the most popular and effective treatments to ease pain and swelling from minor injuries, cold packs come in many different varieties. Hot and cold therapy is one of the oldest and the most effective for muscle sprains and swelling.