The causes of pain in the right side of the chest when exerting force include the following: First, the pain is considered to be caused by strain on the soft tissue of the chest muscles. Mostly due to heavy physical labor or heavy lifting, resulting in strain on the body’s chest muscles and soft tissues. The pain is caused by the contraction of the chest muscles when exerting force. For the pain caused by this cause, it needs to be treated by resting with the external application of blood-stasis-activating ointment. The second cause is due to intercostal nerve pain, which is mostly obvious at rest or at night, and can be relieved by taking nerve-nourishing drugs. The third cause is due to costal chondritis or rib fracture, because after rib fracture, the continuity of the body’s bone is destroyed, and the muscle contraction of the body causes the fracture to displace when force is exerted, thus causing pain.