Dumping is a term used in the context of international trade. It occurs when manufacturers export a product to another country at a price below the normal price with an injuring effect). Dumping is a form of unfair competition as products are being sold at a price that does not accurately reflect their cost. Dumping is legal under World Trade Organization (WTO) rules unless the foreign country can reliably show the negative effects the exporting firm has caused its domestic producers. Countries use tariffs and quotas to protect their domestic producers from dumping.
Dumping syndrome, on the other hand, is a medical condition in which food, especially food high in sugar, moves from the stomach into the small bowel too quickly after eating. This is most often related to changes in the stomach associated with surgery, including any stomach surgery or major esophageal surgery, such as removal of the esophagus. In rare cases, dumping syndrome can develop without a history of surgery or other obvious causes. Symptoms of dumping syndrome include nausea, vomiting, abdominal cramps, diarrhea, and flushing.
To summarize, dumping in economics refers to a kind of injuring pricing, especially in the context of international trade, while dumping syndrome is a medical condition in which food moves from the stomach into the small bowel too quickly after eating.