Spitting up a small amount of blood in the morning may be caused by injuries in the mouth, nose and throat, blood system diseases such as scurvy, digestive system diseases such as peptic ulcer, digestive tract tumors and so on. 1. Oropharyngeal injuries: Spitting up blood in the morning can be caused by bleeding in the mouth, such as bleeding gums or oral ulcers. It may also be caused by bleeding from the damaged mucous membrane of nasopharynx or oropharynx. 2. Blood system diseases: morning blood spitting may also be caused by blood system diseases, such as scurvy may cause a variety of mucous membrane bleeding. This kind of disease is usually caused by the lack of vitamin C in the body. 3. Digestive system diseases: such as gastroduodenal ulcer, esophagitis, gastric cancer and other diseases can lead to damage to the mucous membrane of the digestive tract, blood vessel rupture and bleeding, causing upper gastrointestinal bleeding, resulting in vomiting of blood, which is often accompanied by abdominal pain, abdominal distension, nausea, vomiting, regurgitation of acid, belching and other symptoms. There are many factors that can cause the above symptoms, so once you have vomited blood in the morning, you must go to the hospital in time to improve the examination and find out the specific cause before symptomatic treatment. Avoid further aggravation of the disease, causing greater harm to the body.