A strain on the pectoralis major muscle heals completely in about 2-3 weeks, and the period after the injury is divided into the acute and non-acute phases of the injury. The acute phase is usually within 24-72 hours after the injury, during which the edema and exudation after the trauma are the main cause, and the swelling can be reduced by applying cold compresses. After 72 hours, the swelling begins to gradually subside, you can take the way of hot compress to increase local blood circulation and improve the pain. You can also reduce the pain caused by the disease by applying topical pain relieving creams or taking oral medications to activate blood circulation and resolve blood stasis.