The left side of the ribs under the policy of stabbing pain causes intercostal muscle strain, costochondritis, intercostal neuritis, etc., as follows: 1, intercostal muscle strain: mostly due to sitting posture caused by incorrect, such as long hours of work or twisting the waist to sit, which will cause bilateral intercostal muscle imbalance of force, often triggered by a side of the intercostal muscle strain, manifested as a unilateral costal area of soreness, pain; 2, costochondritis: costochondritis The cause of the disease is unknown, may be related to viral infection, mainly manifested as single rib pain, tingling; 3, intercostal neuritis: intercostal neuritis is often caused by viral infection, the pain is characterized by a single rib, or the gap between the two ribs occurs in a burning, burning-like pain.