A stomach ulcer typically feels like a burning or gnawing pain in the upper middle part of the abdomen, between the belly button and breastbone. This pain can last from a few minutes to several hours and often occurs a few hours after eating or at night, sometimes waking you from sleep. The pain may improve temporarily after eating or taking antacids but tends to return if the ulcer is untreated

. Other common sensations and symptoms associated with stomach ulcers include:

• Feeling full quickly or uncomfortably full after eating
• Indigestion and heartburn
• Nausea and vomiting, sometimes with traces of blood (which may look like coffee grounds)
• Bloating and frequent burping, especially after fatty foods
• Loss of appetite and weight loss
• Pain that may spread to the back or up towards the neck

Some ulcers cause no symptoms (silent ulcers) and may only be noticed if complications like bleeding or perforation occur. Warning signs of complications include sudden sharp abdominal pain, vomiting blood, or passing dark, tar-like stools, which require immediate medical attention

. Triggers that can worsen ulcer pain include stomach acid (often felt on an empty stomach), spicy or acidic foods, alcohol, smoking, stress, and certain medications like NSAIDs or aspirin

. In summary, a stomach ulcer usually feels like a persistent burning or dull pain in the upper abdomen, often linked to meals or nighttime, accompanied by digestive discomfort and sometimes more serious symptoms if complications develop.