Answer
Diarrhoea may be an early sign of immune-related bowel inflammation, which can become serious. Contact the cancer team promptly, particularly with abdominal pain, blood or mucus in stools, or night-time bowel movements.
Sources for this answer
- UK GovernmentUK Government · Reputable Web
- YERVOY 5 mg/ml concentrate for solution for infusion — Current selected SmPCemc · Summary of Product Characteristics