Regurgitation true NICHD FDA Finding Patient Code (Appendix B) Regurgitation Regurgitation https://www.ncbi.nlm.nih.gov/pubmed/28139515 C2004489 Flow in the opposite direction from normal, as the casting up of undigested food or gas from the stomach, or the backward flowing of blood into the heart, or between the chambers of the heart when a valve is incompetent. Regurgitation Flow in the opposite direction from normal, as the casting up of undigested food or gas from the stomach, or the backward flowing of blood into the heart, or between the chambers of the heart when a valve is incompetent. C50726 Regurgitation digestive system symptom