What are ulcers typically characterized by?

Ulcers are primarily characterized by open wounds or sores that develop in the lining of the digestive tract, commonly known as peptic ulcers. These can occur in various parts of the digestive system, including the stomach (gastric ulcers) and the upper part of the small intestine (duodenal ulcers). The development of these sores is often associated with factors such as excess stomach acid, long-term use of nonsteroidal anti-inflammatory drugs (NSAIDs), and infections, particularly with Helicobacter pylori bacteria. Recognizing ulcers is crucial because they can lead to significant complications if left untreated, such as bleeding or perforation of the digestive tract. The focus on the digestive tract in relation to ulcers sets it distinctly apart from other medical conditions included in the other answer options, which pertain to different body systems or issues unrelated to ulcers specifically.