Hidden pain on the left side of the chest below the ribs may be caused by costochondritis, intercostal neuralgia, pleurisy, coronary heart disease and other diseases. 1. costochondritis: the left side of the chest below the ribs hidden pain may be costochondritis caused by the cause is not clear, may be related to infection, trauma, strain, immunity and other factors. 2. Intercostal neuralgia: Hidden pain on the left side of the chest below the ribs may also be related to intercostal neuralgia, usually associated with thoracic spine degenerative changes, thoracic spine tuberculosis, thoracic spine injuries, etc., or with the ribs, mediastinum and other lesions. In addition, herpes zoster virus infection can also cause intercostal neuralgia. 3. Pleurisy: Hidden pain on the left side of the chest below the ribs may also be related to the occurrence of pleurisy. Usually associated with infection, autoimmune disease, malignant tumor and other factors. 4. Coronary heart disease: coronary heart disease patients with angina pectoris, there may be the symptoms of the left side of the chest below the ribs hidden pain, may be pressure, tightness, burning pain. Causes of the left side of the chest below the ribs hidden pain for more reasons, it is recommended that patients actively seek medical treatment to avoid delays in the condition.