Symptoms before gastrointestinal bleeding include acid reflux, subglottic pain, black stools, heartburn, weakness, dizziness and other discomforts, while some bleeding is asymptomatic before. Some of the patients will have uncomfortable symptoms such as acid reflux, eructation, subglottic pain, heartburn, black stools, heartburn, fatigue, dizziness, etc., before gastrointestinal bleeding, and some of them are asymptomatic before gastrointestinal bleeding. Symptoms before gastrointestinal bleeding are mostly related to the disease causing the bleeding, the amount of gastrointestinal bleeding, the speed of bleeding, the increase of blood loss, vomiting blood, black stools, dizziness, weakness and other uncomfortable symptoms are obvious, and may even be life-threatening. In case of abnormal results of stool routine, blood routine and other tests, it is recommended to consult a doctor in time to clarify the cause of the disease with the help of the doctor and to carry out targeted treatment or therapy.