The causes of pain inside the ribs are chondromalacia, intercostal neuritis, intercostal muscle strain, etc. The details are as follows: 1, chondromalacia: the cause is unknown, and many studies have shown that it may be related to viral infection and endocrine metabolic imbalance, mainly manifested as pain in a single rib; 2, intercostal neuritis: mostly related to viral infection, the pain of the intercostal nerve is distributed in a band, along one or two intercostal spaces The pain is more intense, and the nature of the pain is mostly burning-like pain; 3, strain on the intercostal muscles: for example, prolonged sedentary, improper sitting posture, etc., may cause an imbalance in the force on the intercostal muscles bilaterally, which can cause strain on one side of the intercostal muscles, which will manifest as pain in one side of the rib region.