Gastrointestinal bleeding refers to bleeding that occurs anywhere along the digestive tract, from the esophagus to the rectum. It may present as vomiting blood, black tarry stools, or bright red blood in the stool, depending on the location and severity of the bleed. Common causes include ulcers, gastritis, esophageal varices, diverticulosis, inflammatory bowel disease, hemorrhoids, or colorectal cancer. Symptoms may also include abdominal pain, weakness, dizziness, or signs of anemia such as fatigue and shortness of breath. The severity can range from mild and self-limited to life-threatening, particularly if blood loss is significant. Prompt medical evaluation is essential to identify the source of bleeding and initiate appropriate treatment, which may involve medications, endoscopic procedures, or surgery.