Abstract
Cancer patients undergoing chemotherapy treatment will experience various effects. One effect is a disruption in the oral cavity that is often known as oral mucositis. Oral mucositis is a collection of symptoms that can be observed by nurses. Side effects of oral mucositis can cause further infections in the oral cavity, decreased appetite, and will later affect the quality of life. The purpose of this study was to determine the degree of oral mucositis that occurs in patients undergoing chemotherapy at PKU Muhammadiyah Hospital in Yogyakarta before and after using coffee mouthwash. This research is a quasi study. Sampling was done with a purposive sampling technique with a sample size of 15. The results showed that The degree of oral mucositis mostly experienced by chemotherapy patients in this study was grade 1. There was a decrease in the degree of oral mucositis in patients after giving coffee mouthwash. The average degree of oral mucositis after the use of coffee mouthwash is 0.40. There was a significant change between before and after giving coffee mouthwash with a p-value <0.05.

Key words: cancer patient, coffee mouthwash, oral mucositis