Multiple myeloma is a neoplasm of plasma cells. Observed usually in patients over 65 years of age. This case report 41 year old has been prepared in order to determine the nursing diagnoses grouped according to the "Functional Health Patterns" model and to evaluate them in the nursing care plan of a patient who was diagnosed with multiple myeloma as a result of the examination which is that were noticed during a different examination. In the case for the problems; diagnoses of acute pain, sleep disturbance, undernutrition, deterioration of oral mucous membrane, constipation, fatigue, activity intolerance, risk of deterioration in individual identity, risk of deterioration in individual resistance, and nursing interventions for these diagnoses were planned and implemented. Before the study, verbal and written consent was obtained from the patient, and the data were collected by face-to-face interview method. As a result; the patient care process, which was planned and applied in line with the functional health patterns model, provided a positive improvement in the patient's behaviors that would negatively affect the disease process such as facilitated discharge, and guided nurses about care, effectiveness and follow-up of treatment. This model is recommended for the effective implementation of nursing care in clinics such as hematology, oncology, palliative care, where patients need to be followed actively.