Thoracic radiation therapy can lead to radiation esophagitis, and patients are prone to dry mouth, sore throat, and difficulty swallowing, so be sure to eat soft foods to avoid irritating the throat area. Avoid sour and spicy foods, such as fewer oranges and tomatoes to avoid irritating the mouth. Avoid foods that are rough and have sharp edges, such as hard fruits and vegetables, crackers, etc. You can cook and eat the fruits.