Left rib pain is not necessarily an early sign of cancer. Left rib pain due to cancer is commonly accompanied by severe pain, fever, emaciation and other malignant manifestations. Left rib pain may be caused by a variety of reasons, the common reasons may be rib injury, chest wall injury, internal organ injury, etc.: 1, rib injury: common external factors may cause rib injury such as fracture, most have a history of trauma, visible damage to the chest; common strain, trauma and other causes of costochondritis, can also lead to left rib pain, pain is obvious when pressed hard; 2, chest wall diseases: common chest wall related disease May also lead to left rib pain, such as pleurisy, herpes zoster, etc. Coughing or deep inhalation may lead to pain aggravation, which may also be accompanied by skin lesions, fever and other symptoms; 3, organ system diseases: gastrointestinal system, cardiovascular system, respiratory system of a variety of diseases can lead to the symptoms of left rib pain, such as gastroesophageal reflux, angina pectoris, pneumothorax, and other diseases, more vicious, belching, chest tightness asthma, etc., and it is recommended that a Further examination; 4, other: there may be thoracic vertebrae subluxation caused by disc herniation or osteophytes, direct compression or indirect impact on the nerves caused by spinal thoracic pain caused by left rib pain, often radiating pain, accompanied by pressure pain and involving pain. It is recommended to go to the hospital in time for chest radiographs, electrocardiograms and other examinations to determine the cause of the disease and treat the symptoms.