Hi there - don't be scared. Most causes of abdominal pain can be sorted out quite easily and quickly. Abdominal pain can come on with a number of things - bowel problems such as Irritable Bowel Syndrome. You can also have pain with bladder and kidney infections. Women of course can have problems with abdominal pain due to their period. But whatever it is, it can be sorted. So please speak to your doctor. You'll feel a lot less anxious once you do and you'll get something to ease the pain as well. Lots of luck.
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