Hi, Although it is rare but hemoptysis can occur following anesthesia. As a result of anesthetic induced negative pulmonary pressure blood vessels in the lung undergo damage resulting in coughing of blood following general anesthesia. There is nothing to worry, it is generally a benign condition and results in full recovery within a couple of days however the possibility of chronic lung disease such as tuberculosis must be ruled out. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Mohammed Taher Ali, General & Family Physician