The back was hit and spit out blood is generally more serious, this situation is likely to be due to capillary rupture, acute gastric mucosal injury, pulmonary contusion and other factors. 1. capillary rupture: when the back is violently hit or bumped, it may lead to the body capillary rupture bleeding, triggered by the emergence of spitting blood, generally accompanied by coughing, coughing up phlegm symptoms, it is recommended that the use of panax notoginseng tablets under the guidance of a doctor or Yunnan Baiyao capsule and other medications. 2. Acute gastric mucosal injury: the back was hit and spit out blood may be due to acute gastric mucosal injury, the main symptom of this disease is upper gastrointestinal bleeding, you can use omeprazole enteric-coated tablets under the guidance of a doctor, Yunnan Baiyao capsules and other drugs for relief! 3. Lung contusion: lung contusion is usually caused by trauma to the lungs, usually combined injuries, usually chest pain, cough, hemoptysis, shortness of breath and other symptoms, once appeared, need to be dealt with in a timely manner, you can use amoxicillin capsules, cefaclor dispersible tablets under the guidance of a doctor and other drugs to prevent infection. The back was hit and spit out blood must go to the hospital in time for examination and treatment, so as not to be injured seriously and cause irreversible damage to the body.