The spitting of blood in the saliva will be gone in a while: 1, if it happens once in a while, do not worry too much, it is recommended to observe. The main thing for patients is to eat lightly, do not stay up late, do not be too greedy for cold in summer, appropriate exercise can, but also prohibit spicy, irritating food. 2, the most common spit with blood is gingivitis and periodontitis, which leads to local capillaries of the gums are very brittle, very light external force will lead to bleeding. 3, if this phenomenon occurs frequently, must go to the hospital to do lung CT or laryngoscopy to further clarify the diagnosis. diagnosis. This disease is usually caused by occasional fire, or coughing too hard can also cause blood in the sputum, generally not a big problem. 4, also seen in chronic pharyngitis resulting in mucosal capillary damage. 5, there is also mainly seen in the respiratory system bleeding, such as trachea, bronchial or pharyngeal injury caused by. So if this phenomenon often occurs, you must go to a regular hospital in a timely manner to improve the relevant examination and choose a reasonable treatment method.