The main reason for respiratory distress is to find out the cause of respiratory distress first, and then do the corresponding first aid according to the cause, as follows: 1. For advanced lung cancer with brain metastasis causing respiratory distress, immediately treat with mannitol for dehydration and methylprednisolone hormone for sedation. 2. For bronchial stenosis caused by lung cancer, active anti-cancer treatment such as chemotherapy, targeted therapy, and bronchial stent intervention can be used for patients with obvious bronchial stenosis. 4. Heart failure can be treated with cardiopulmonary diuresis and myocardial nutrition.