Your stomach hurts
You may associate stomach pains with spoiled food or PMS cramps. You should add your morning brew to that list as well. European scientists found that certain compounds in coffee stimulate the secretion of stomach acid by your stomach cells, according to WebMD. Taking an over-counter medication like Tums can neutralize the acid short-term, but if you suspect coffee is making your stomach hurt, think about changing your coffee consumption habits to feel your best.