The causes of chest pain when the body is tilted back are as follows: 1. suffering from costochondritis, some young women are prone to non-specific costochondritis, which may cause chest pain; 2. pain is more pronounced and may also radiate to the back of the shoulder, causing pain in the back of the shoulder or pain in the upper limb, and the patient may experience increased pain during vigorous activity, deep breathing or coughing; 3. Pain in the chest when leaning back may also be intercostal neuritis, which may lead to intercostal neuritis due to viral infection, resulting in pain along the distribution area of the intercostal nerve, and patients may experience increased pain when leaning back due to the pulling of the intercostal nerve; 4. Diseases such as cardiac neurosis. Therefore, in this case, further examination is needed to clarify the diagnosis and to provide targeted treatment according to the cause.