Q&A: What is causing my stomach pains at 19 weeks?

If you had said your right upper abdomen, I'd be quick to blame your gall bladder. Mid upper abdominal pain goes along with gastritis or esophageal hernia. It's possible that these GI symptoms may radiate to the left side, but it's uncommon. The only thing on your left side is your spleen, but a problem with it would be disastrous very quickly, and by this time you're clear of that danger. I suppose angina is a possibility, but the positional relationship to the occurrences are agains that, too. It may be that as you use your intercostal muscles to help you breathe--normal as the fundus obtunds the diaphragm--that you've strained these muscles, and that could take weeks to cool down. You may have old scarring over your pleura, and the increased intercostal muscular activity is causing inflammation there as well. If you're going to have one quadrant hurt, the upper left is the most innocent. And also the most mysterious. Thankfully, this pain will probably resolve as mysteriously as it began, with no real answer ever.