People grasp the common sense of first aid is very good for emergency early treatment, the following is a brief introduction to the common sense of first aid in life: nasal bleeding can be used to pinch both sides of the nose for 4 to 8 minutes or fill the nasal cavity with a cotton ball soaked in ice water to stop the bleeding by pressure. It is not correct to tilt your head when you have a nosebleed. Instead of stopping the bleeding, it will cause nosebleed to flow backwards into the trachea and cause asphyxiation. In case of heat stroke, the patient should be quickly moved to a cool, ventilated place and kept at rest quietly. To undress and wipe the body with a cold towel to quickly lower the body temperature. You can let heatstroke patients drink light salt water, cool drinks, etc. Patients with severe heatstroke will experience confusion, convulsions and other symptoms, and should be immediately sent to a hospital for treatment. When the skin is red, swollen and painful from a sunburn, apply a cold towel to the affected area and apply some moisturizer appropriately. If you have a blister on your skin, don’t pick it out to avoid secondary infection and go to the hospital for professional treatment. The actual bee sting should be pulled out of the residual stinger, gently squeeze out the venom, and apply a little ammonia, soda, etc. If the patient has an abnormal reaction such as nausea and dizziness, he or she should be sent to the hospital immediately for treatment. Immediately after the burn should be rinsed with cold water or cold compress on the wound, which should last for more than 15 minutes. Do not apply medicine to the wound without permission, and do not smear the wound with soy sauce, vegetable oil, etc. If there is a blister at the burn, do not pick it out, use clean gauze to cover it and send it to the hospital for treatment. After the fracture, make sure to fix the injured limb before sending it to the hospital, otherwise the abnormal activity of the fractured end will aggravate the injury. After a spontaneous pneumothorax attack, it is strictly forbidden to pat the back and carry the patient, and the patient should be placed in a flat position. If oxygen is available at home, oxygen should be administered immediately, and call 120 emergency.