It can be due to many causes sich as peptic ulcer
whose pain is aggravated after meals. It can be due to Renal colic
whose pain is localised to lumbar region and radiating to the groin. If u have any Symptom related to urination such as burning micturition or increased frequency or else you should have an ultrasound KUB with full bladder for any obstruction and urine R/E for any infection. If the pain is localised to center of the belly You should have and Ultrasound abdomen to rule out other causes of abdominal pain
such as stone in the gallbladder
or other causes of pain.
It may be due to after taking food that is gastritis you can use Omeprazole
for that that is antacid.
I hope I am sucessful in solving your query If u have further you can ask me
Get well soon
Dr. Azhar Sattar