Traumatic brain injury, fall on the back of the head, generally not directly due to traumatic brain injury caused by the nostrils do not breathe, may be combined with nasal injury, colds, allergies and other causes of nasal congestion. The fall on the back of the head may cause local soft tissue and bone damage, resulting in local soft tissue edema, bone fracture, etc., and may cause brain tissue damage causing headache, nausea, vomiting, and even consciousness disorder, coma and so on. 1. Combined nasal injury: Traumatic brain injury may also cause nasal injury, resulting in nasal congestion. If there is no combined nasal injury, it will not directly cause the symptom of nasal obstruction. 2. Colds: Colds can be caused by exposure to cold or influenza viruses, which can lead to acute rhinitis, resulting in nasal congestion. 3. Allergy: Allergy to certain foods, medicines, or external allergens can also cause the nostrils to become non-ventilated, and in some cases, it can cause symptoms such as a runny nose, sneezing, and watery eyes. Traumatic brain injury back of the head fall mainly to check whether there is brain tissue damage and other conditions, the emergence of nostril ventilation, need to go to the hospital to check the cause.