A possible treatment for patients with lymphoma and myeloma is stem cell transplantation (SCT). SCT is preceded with cytostatic treatment. There are several side effects related to this treatment, for example fatigue, nausea, constipation/diarrhoea, pain, mucositis and loss of appetite. Aim: Investigate which side effects related to the treatment where most troubling after SCT and if nurse assessment and patient assessment differ. Methods: A quantitative empirical study with repeated measuring. The two groups of nurses and patients answered a form independently. Results: Loss of appetite and fatigue are the most troubling side effects according to both nurse and patient. Older patients tended to be more affected by fatigue. The nurses estimated the side effects such as loss of appetite, fatigue, diarrhoea and nausea lower than the patients did. Conclusion: No definitive conclusion could be made because of the small patient/nurse sample. However, there is a tendency showing difficulty for nurses to estimate correctly the side effects suffered by the patients. The nurses tend to estimate the side effects lower than the patients do.