Symptoms of coughing up fresh blood are often serious and are mainly considered to be caused by lung tumors, aortic aneurysms, rheumatic heart disease, mitral valve stenosis, bronchiectasis, tuberculosis, leukemia, aplastic anemia, and other diseases. This symptom can also be caused when there is bronchial dilatation, lung abscess, or lobar pneumonia. If the amount of coughing up blood is relatively large it is necessary to stop the bleeding in time, and to prevent obstruction of the airway causing asphyxiation during the process of going to the hospital. If the amount of bleeding is not very large, it is necessary to find the cause and actively treat the original disease. In general, you should pay attention to your diet, avoid eating stimulating foods, take vitamin C supplements, drink more water, and eat more fresh vegetables and fruits.