Deep inhalation pain inside the back may be caused by trauma, pleurisy, pneumothorax and other reasons. 1. Trauma: when the position of the back is violently injured, which may cause rib fractures or local muscle and other tissue damage, deep inhalation will be accompanied by pain inside the back. 2. Pleurisy: Pleurisy is a common disease in respiratory medicine, which is caused by a variety of reasons. It mainly manifests as stabbing and pulling pain in the chest, and the pain will be aggravated when the patient inhales deeply or coughs. 3. Pneumothorax: Pneumothorax is formed after the rupture of alveoli, and adhesion occurs between the alveoli and chest wall. When the patient takes a deep breath, coughs violently or exercises, the adhesion area ruptures, resulting in the phenomenon of pain in the back after deep inhalation. Clinical deep inhalation back pain, may also be rib chondritis, angina and other causes, the patient should consult a doctor in a timely manner, to clarify the cause of the correct treatment.