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.