The left side of the ribs under the pain may be muscle strain, intercostal neuralgia caused by these diseases ct can not check out, so the ct is normal. Left side subcostal pain according to ct normal may be caused by muscle strain, which is related to the daily sitting posture, sports posture is not appropriate, it will cause the left side of the intercostal muscles overconsumption, loss of the original flexibility and coordination resulting in strained left side subcostal pain, so due to muscle strain, ct examination does not come out, so the results will show normal. Left side subcostal pain according to ct normal may intercostal neuralgia caused by intercostal nerve is located in each rib below and above the ribs, by trauma and other stimuli will produce pain, along the intercostal to the chest and abdomen anterior wall of radiating pain, a semi-circumferential distribution, do ct may not be able to find out the results show normal. Therefore, the left side of the subcostal pain photo ct normal should go to the hospital as soon as possible to clarify the cause of the disease, under the guidance of the doctor for standardized treatment.