It sounds like you are experiencing gastroesophageal reflux, commonly known as acid reflux. When you lie down after eating, stomach acid and fluids can easily flow backward into your esophagus. This irritation can trigger a cough reflex and produce a clear or white fluid. Since antacids provide relief, this strongly points to reflux. To help manage this, try waiting at least two to three hours after eating before lying down, and consider elevating the head of your bed. I encourage you to consult a healthcare professional for a proper evaluation and to discuss long-term management options.
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What could cause a persistent cough with white fluid when lying down after eating, which is relieved by taking antacids?