Maybe he ate too much junk food.
It could be that he has a stomach bug. There are many viruses that can cause pain in the belly. He might have caught one, for example, by not washing his hands properly before eating. Another possibility is that he is allergic to something he ate. If he ate a new type of food that his body doesn't like, it can lead to abdominal pain.
One possible reason could be indigestion. If a girl eats too much junk food or something that doesn't agree with her stomach, it can cause pain. For example, consuming a large amount of spicy food might irritate the stomach lining.
Food poisoning can be a reason. Just like if a woman eats something rotten or contaminated, it can lead to a bad belly ache.
One reason could be diet. If a boy consumes a lot of high - calorie foods like junk food and sugary drinks regularly without much exercise, he is likely to gain belly fat. For example, eating a lot of fried chicken and soda.
In the fanfiction about Maria from Roswell having a belly ache, it could be a side effect of a new power she's developing. Since Roswell is full of alien - human hybrids and people with special abilities, if Maria is on the verge of getting a new power, her body might be going through some changes that are causing the belly ache. Also, she could have been poisoned by someone who doesn't like her getting too close to the alien secrets. There are many characters in Roswell with different motives, and this could be a way to keep her out of the loop for a while.
It could be that she ate something bad. Maybe she had some alien food that didn't agree with her human digestive system. In a lot of Roswell - related fanfictions, there are often strange new foods or substances that the characters come across.
Food is a common cause. For example, eating too much junk food or food that has gone bad can lead to a belly ache.
There could be many reasons. Maybe she ate something bad like spoiled food. It could also be due to stress or anxiety which can often affect the stomach.
He might have taken some medicine.
If the pain is due to indigestion, lying down on her side in a comfortable position and taking it easy for a while can be beneficial. Avoiding any strenuous activity gives the stomach time to settle. Also, over - the - counter antacids can be used if the pain is caused by excess stomach acid, but it's best to consult a doctor or pharmacist first.
I knew a boy who had a belly ache because he ate some expired snacks. He started feeling pain in his belly not long after. His parents rushed him to the hospital where he was given medicine to relieve the pain and help with his digestion.