Nausea, heartburn, indigestion, upset stomach — anemia? Frequent sufferers of gastrointestinal symptoms may be doing more harm than good every time they reach for certain over-the-counter medications designed to relieve symptoms like acid reflux and heartburn. A new study out of Brazil evaluated the impact of prolonged use of proton pump inhibitors (PPIs), the technical term for this range of medicines — and what researchers found was stomach-churning. The most common PPIs are known by the