Question

My abdomen hurts why?

Answer 1

Answer:

Whether you've got a mild ache, sharp pain, or cramps, abdominal pain can have many causes. For instance, you might have indigestion, constipation, a stomach virus, or, if you're a woman, menstrual cramps.  You may also get abdominal pain if you're lactose intolerant or have ulcers or pelvic inflammatory disease.

Explanation:

Answer 2

There are soooooooooooo many different reasons that it could hurt.
Including:
Gastroenteritis (stomach flu)
Gas
Irritable bowel syndrome (IBS)
Acid Reflux
Vomiting
Ate something bad
Constipation
Gastritis
Gastroesophageal reflux disease (GERD), basically just extreme acid reflux
Stomach or Peptic Ulcers
Pulled or strained muscles
Cramps.

It’s most likely one of the last two, as the rest are very uncommon. The only way to know for sure is to ask a doctor. And unless you where diagnosed previously with a disease or something like GIRD or IBS, then it’s probably just strained muscles or a cramp (air pockets in your muscles) which both go away with rest.
Hope this helps!