A stomach ache is a term often used to refer to cramps or a dull ache in the tummy (abdomen). It's usually short-lived and is often not serious.Severe abdominal pain is a greater cause for concern. If it starts suddenly and unexpectedly, it should be regarded as a medical emergency, especially if the pain is concentrated in a particular area.Call your GP as soon as possible or go to your nearest hospital accident and emergency (A&E) department if this is the case.If you feel pain in the area around your ribs, read about chest pain for information and advice. Possible causes in adults include: •irritable bowel syndrome (IBS) – a common condition that causes bouts of stomach cramps, bloating, diarrhoea or constipation; the pain is often relieved when you go to the toilet •inflammatory bowel disease (IBD) – long-term conditions that involve inflammation of the gut, including Crohn's disease and ulcerative colitis •a urinary tract infection that keeps returning – in these cases, you will usually also experience a burning sensation when you urinate •constipation •period pain – painful muscle cramps in women that are linked to the menstrual cycle •other stomach-related problems – such as a stomach ulcer, heartburn and acid reflux, or gastritis (inflammation of the stomach lining) Possible causes in children include: •constipation •a urinary tract infection that keeps returning •heartburn and acid reflux •abdominal migraines – recurrent episodes of abdominal pain with no identifiable cause