When waking up in the morning with blood in the mouth, first of all, pay attention to check whether it is blood in sputum or blood in saliva. If it is blood in saliva, consider the abnormal diseases of the oral cavity, such as gingivitis, periodontitis, oral ulcers, as well as bad dietary habits, living habits, such as smoking, drinking, overeating, staying up all night, or consuming greasy, deep-fried, spicy, stimulating food and so on. You need to improve your eating and living habits, and take care of your mouth, brush your teeth and rinse your mouth in a timely manner to see if your symptoms improve. If there is blood in the sputum, it is necessary to pay attention to whether there are lung diseases, such as lung cancer, acute tuberculosis, etc., and need to do further lung CT examination to clarify.