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The pressure that you describe at the right side of your stomach could be due to any of the organs lying on that side which includes, Biliary colic or Gallstones, Cholecystitis or inflammation of the gallbladder, Duodenal ulcers, Kidney Stones / ureteric stones, Appendicitis, Ovarian cyst, Ectopic pregnancy, Constipation, Pulled muscle, Trapped wind, Crohn's disease, and ulcerative colitis.
The best way to find out the exact cause is to go ahead with an examination done by your doctor/healthcare provider along with an ultrasound scan of abdomen.
If the problem is become bothersome affecting your daily life, then do not delay your visit to your doctor/healthcare provider.
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