ulcer

An ulcer isn't just any sore; it's a break in tissue, often in the lining of the digestive system or on the skin. Think of it as a small open area where the surface has been worn away. You might hear about stomach ulcers, often caused by bacteria or long-term use of certain medicines, which can lead to burning or gnawing pain. But they can also appear on the skin, especially where pressure lasts too long. These are called pressure ulcers, also known as bedsores.

They aren't contagious, but they are signs that something isn't quite right and often need medical attention. A corneal ulcer, for example, affects the clear front surface of the eye and can threaten vision if left untreated. The word comes from Latin ulcus, meaning "wound," which matches its sense of damaged, open tissue.

An ulcer is a sore that forms when the surface of tissue breaks down, leaving an open area. It can develop on the lining of the digestive tract, on the skin, or in other parts of the body. It is more than a simple irritation because it involves real tissue damage. Many people first think of stomach ulcers, but this kind of sore can appear in several places.

*Digestive Ulcers: These are often caused by infection with Helicobacter pylori* bacteria or by long-term use of nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen. Symptoms can include burning stomach pain, nausea, and bloating. In simple terms, the protective lining is damaged, and digestive acid irritates the tissue underneath.

*Skin Ulcers:* These can develop when pressure cuts off blood supply to an area, often over bony places like the heels, hips, or lower back. They are common in people who are bedridden or have limited mobility and are known as pressure ulcers, or bedsores. Other skin ulcers can be caused by poor circulation, infection, diabetes, or injury.

*Other Ulcers:* They can also form in other areas, such as the mouth, the cornea of the eye, and the legs, especially when blood flow is poor.

The word "ulcer" comes from the Latin ulcus, meaning "wound." Historically, it referred to any open sore. Today, it still points to a break in tissue, but the place where it forms matters a lot for diagnosis and treatment. Ignoring one can lead to problems like bleeding, infection, or even perforation, which means a hole can form through the wall of an organ.