Background and Method: To identify the cause of conflicts between medical residents and nurses during daily care practices in a general medicine ward, we observed and conducted interviews with 12 residents in their second postgraduate year. Results: We found three typical situations that are likely to lead to conflicts. 1) Both residents and nurses, especially when they are less experienced, are too occupied with their daily tasks to understand their counterpart's difficulties. 2) Nurses push residents to make quicker decisions beyond their discretion and ability. 3) The medical priority of making a precise diagnosis conflicts with the nursing priority of keeping patients comfortable.