Whether a muscle strain appears swollen or not is directly related to the severity of the strain, and to the location of the body where the strain occurs, as well. If the strain is minor, swelling symptoms will not usually appear; however, if it is a location where the soft tissues such as the fingers, ankle, or neck are loose and the pressure between the tissues is relatively low, swelling symptoms may appear. Regardless of the severity of the strain, soft tissues such as muscles and ligaments will show some breakage, which may be very subtle or serious and obvious. If the strain is serious, the soft tissue breakage will be relatively serious, and the chance of swelling symptoms will increase, but strains like those in the thoracic rib cage and low back are generally difficult to develop local swelling symptoms. This is because the pressure between the local muscles and fascia is relatively large, the muscles and fascia are less elastic, the soft tissue blood circulation is relatively not rich, even if a more serious strain occurs, there may not be symptoms of swelling.