There are many conditions that can cause this phenomenon, such as long-term chronic exertion, strain, or prolonged exposure to cold on both sides of the rib cage, which can lead to intercostal muscle damage and impaired lactic acid metabolism within the muscle, causing hidden pain. In addition, if the patient has costochondritis, costal neuritis, or local fasciitis on both sides, it can cause this symptom. In this case, the patient can be instructed to reduce standing and weight-bearing activities and to rest in bed. The above can promote local blood circulation and accelerate the metabolism of lactic acid, thus relieving pain.