• Burning stomach pain
• Feeling of fullness, bloating or belching
• Fatty food intolerance
• Heartburn
• Nausea

The most common peptic ulcer symptom is burning stomach pain. Stomach acid makes the pain worse, as does having an empty stomach. The pain can often be relieved by eating certain foods that buffer stomach acid or by taking an acid-reducing medication, but then it may come back. The pain may be worse between meals and at night.

Nearly three-quarters of people with peptic ulcers don't have symptoms.

Less often, ulcers may cause severe signs or symptoms such as:

• Vomiting or vomiting blood — which may appear red or black
• Dark blood in stools, or stools that are black or tarry
• Trouble breathing
• Feeling faint
• Nausea or vomiting
• Unexplained weight loss
• Appetite changes

Peptic ulcers occur when acid in the digestive tract eats away at the inner surface of the stomach or small intestine. The acid can create a painful open sore that may bleed.

Your digestive tract is coated with a mucous layer that normally protects against acid. But if the amount of acid is increased or the amount of mucus is decreased, you could develop an ulcer. Common causes include:

• A bacterium. Helicobacter pylori bacteria commonly live in the mucous layer that covers and protects tissues that line the stomach and small intestine. Often, the H. pylori bacterium causes no problems, but it can cause inflammation of the stomach's inner layer, producing an ulcer.

It's not clear how H. pylori infection spreads. It may be transmitted from person to person by close contact, such as kissing. People may also contract H. pylori through food and water.

• Regular use of certain pain relievers. Taking aspirin, as well as certain over-the-counter and prescription pain medications called nonsteroidal anti-inflammatory drugs (NSAIDs) can irritate or inflame the lining of your stomach and small intestine. These medications include ibuprofen (Advil, Motrin IB, others), naproxen sodium (Aleve, Anaprox, others), ketoprofen and others. They do not include acetaminophen (Tylenol).

Peptic ulcers are more common in older adults who take these pain medications frequently or in people who take these medications for osteoarthritis.

• Other medications. Taking certain other medications along with NSAIDs, such as steroids, anticoagulants, low-dose aspirin, selective serotonin reuptake inhibitors (SSRIs), alendronate (Fosamax) and risedronate (Actonel), can greatly increase the chance of developing ulcers.

In addition to taking NSAIDs, you may have an increased risk of peptic ulcers if you:

• Smoke. Smoking may increase the risk of peptic ulcers in people who are infected with H. pylori.
• Drink alcohol. Alcohol can irritate and erode the mucous lining of your stomach, and it increases the amount of stomach acid that's produced.
• Have untreated stress.
• Eat spicy foods.

Alone, these factors do not cause ulcers, but they can make them worse and more difficult to heal.

Left untreated, peptic ulcers can result in:

• Internal bleeding. Bleeding can occur as slow blood loss that leads to anemia or as severe blood loss that may require hospitalization or a blood transfusion. Severe blood loss may cause black or bloody vomit or black or bloody stools.
• Infection. Peptic ulcers can eat a hole through (perforate) the wall of your stomach or small intestine, putting you at risk of serious infection of your abdominal cavity (peritonitis).
• Obstruction. Peptic ulcers can block passage of food through the digestive tract, causing you to become full easily, to vomit and to lose weight through either swelling from inflammation or scarring.