Essential oils can also provide natural relief for an upset stomach. Some popular options include chamomile, ginger, lavender, and cinnamon oil. You can inhale the oils through a diffuser, use them as a mouthwash diluted with water, or even add them directly to your bath water. Avoid taking aspirin or ibuprofen (Advil, Motrin IB); These medications can further irritate the stomach and worsen abdominal pain; Consider taking acetaminophen (Tylenol) instead, as this safer option can still provide relief.