Intercostal neuritis, pleurisy, lung tumor, trauma, etc. are the main considerations for subcostal pain. 1. Intercostal neuritis: viral infection or trauma and other factors, resulting in intercostal neuritis, manifested as a band of pain along the distribution of intercostal nerves, mostly stabbing or burning pain, pain can be aggravated by deep breathing or coughing. 2. Pleurisy: such as tuberculous pleurisy, the inflammation invades the pleura or pleural effusion, which can cause pleural irritation pain, accompanied by low-grade fever, night sweats and other systemic symptoms. 3. Lung tumor: when there is a tumor in the lung and the tumor gradually spreads and invades the pleura, chest pain, chest tightness, dyspnea and other symptoms will appear. 4. Trauma: Trauma causes local soft tissue injury or rib fracture, which is mostly manifested as chest pain, chest tightness, etc. The pain can be aggravated when coughing or changing the position, and the skin lesions or bruises can be seen locally. Rib pain under the chest can also be seen in other diseases, it is recommended that patients seek timely medical treatment, so as to avoid delaying the condition.