When stretching chest pulling pain is because when stretching chest muscle contraction pulling stimulation of local lesion area muscle or rib periosteum nociceptive nerve endings caused. It is common in chest trauma, costochondritis and body fatigue. 1. Chest trauma: soft tissue contusion of the front chest wall, rib fracture, sternal fracture, stretching chest muscle contraction pulling the contused muscles and soft tissues or pulling the fracture end causing displacement, causing chest pain. 2. Costal chondritis: inflammatory disease occurring in the rib cartilage, mostly caused by non-infectious factors, stretching, deep breathing, activities, after exertion will appear in the lesion area or aggravate the pain, which can be alleviated after rest. 3. Organic fatigue: prolonged sitting position remains unchanged, organic fatigue, sudden stretching can be caused by excessive contraction of the anterior chest muscles, pulling, thus appearing in the chest tugging pain performance, generally after resting the pain can be relieved. The pain can be relieved after resting. If you have chest pain when stretching and continue to have no relief, it is recommended to go to the hospital for further consultation and treatment.