Loss of sense of smell after a car accident may be caused by compression or damage to the olfactory nerve, which can be treated with medication or surgery. 1. Compression of the olfactory nerve: Broken bone or hematoma after a car accident may cause nerve compression. Surgery can be performed in the hospital to remove the hematoma or other foreign objects that cause compression, and release the compression in a timely manner, so that the sense of smell can be restored with a higher likelihood. 2. Nerve damage: The loss of sense of smell caused by car accident may be due to the damage of the olfactory center or olfactory nerve. It can be treated with some nutritive drugs, such as methylcobalamin, cytarabine, ginkgo biloba extract tablets, or intramuscular injection of vitamin B. However, if the nerve has been completely dislodged from the nerve, it is possible to recover the sense of smell in time. However, if the nerve has been completely severed, healing is more difficult. If the sense of smell fails after a car accident, the olfactory center may also be damaged, and you should go to the hospital in time to find out the cause and standardize the treatment. All of the above medications should be used under medical advice.