The causes of chest tendon pain mainly include chest muscle and soft tissue strains, chest rib cartilage strains, respiratory system diseases, intercostal neuralgia, etc., as follows: 1, chest muscle and soft tissue strains: mostly due to the usual lifting of heavy objects, lifting the upper limbs or engaging in sports and other causes of chest muscle strains, which in turn cause pain. This cause of chest tendon pain can be significantly relieved through rest and with the external use of blood circulation drugs; 2, chest rib cartilage strain, rib cartilage fracture or rib chondritis, etc.: mostly due to the usual physical exercise and other causes of chest cartilage strain, and cause chest pain; 3, respiratory system diseases: mostly due to acute pleurisy, pulmonary blister rupture and spontaneous pneumothorax and other causes of chest pain, accompanied by breathing suffocation wheezing, chest tightness and other respiratory symptoms; 4, intercostal neuralgia: intercostal neuralgia is a sterile inflammatory disease, mostly painful at rest or at night, can be relieved with the use of nerve-nourishing drugs.