Citrus reticulata, commonly known as tangerine or mandarin orange, has a long history of use in traditional Chinese medicine (TCM) for digestive complaints, including belching. The dried peel, known as "Chen Pi," is one of the most common herbal ingredients in TCM formulas aimed at regulating qi (energy flow), resolving phlegm, and harmonizing the middle burner (the digestive system). According to TCM theory, belching is often attributed to "rebellious qi," which can result from stagnation or improper movement of the digestive energy. Chen Pi is traditionally believed to promote the movement of qi, reduce bloating, and alleviate symptoms such as belching and fullness.

Historical texts such as the Shennong Bencao Jing and later materia medica works consistently describe the use of Citrus reticulata peel for these purposes, and its use persists in modern TCM practice. However, while some in vitro and animal studies suggest digestive benefits from compounds in Citrus reticulata peel (such as hesperidin and other flavonoids), robust clinical trials specifically supporting its efficacy for belching are lacking. The evidence for its use in this context is therefore rated as moderate (3), based on its extensive traditional use with some supporting pharmacological rationale, but without conclusive modern clinical validation.