People with mouth ulcers can usually eat grapes. A mouth ulcer is a small broken, ulcerated surface inside the mouth that can be caused by a variety of reasons, such as mechanical injury, including biting or being choked by hard food. Grapes have a softer texture and this does not usually occur. In addition, mouth ulcers are also related to the lack of vitamins and trace elements, such as lack of B vitamins and lack of trace elements of zinc. Grapes are richer in vitamin C, B vitamins, and many trace elements. Eating grapes has a certain supplementary therapeutic effect on mouth ulcers related to nutritional deficiencies and can be eaten more often. The causes of mouth ulcers are complex, some of them may belong to recurrent aphthous stomatitis, which may be related to autoimmune dysfunction; some of them are related to neurological and mental factors, such as tension and stress, which can cause mouth ulcers and require comprehensive conditioning to get effective relief. Eating grapes is beneficial to mouth ulcers, but do not eat overly acidic, unripe grapes to avoid mild irritation of the ulcer surface, causing pain.