Quince (Cydonia oblonga) has a long history in traditional medicine, especially in Middle Eastern and Mediterranean cultures, where it has been used to manage various digestive issues, including nausea and vomiting. In traditional Persian medicine, quince syrup and decoctions have been recommended to soothe the stomach and alleviate symptoms of nausea, particularly in cases of pregnancy-related morning sickness and gastrointestinal discomfort. The fruit's mucilaginous properties, which result from its high pectin content, have been thought to provide a protective coating to the stomach lining and reduce irritation.

Scientific studies on quince for nausea and vomiting are limited. Some preliminary research and animal studies suggest quince extracts may exhibit gastroprotective effects and antiemetic properties, possibly due to antioxidant and anti-inflammatory compounds in the fruit. However, these findings are not robust, and there is a lack of well-designed clinical trials in humans specifically evaluating quince for nausea and vomiting. Therefore, while traditional use is well documented, scientific validation remains weak. The current evidence rating is 2 out of 5, reflecting mostly traditional use with limited supporting scientific data.