Wednesday I went to a cancer rehab program. This week’s topic was fatigue. As our instructor was relating reasons for cancer fatigue, she mentioned cytokines circulating in our bodies. I thought that sounded familiar. Circulating cytokines is also a reason for rheumatoid arthritis fatigue. I mentioned to the instructor that rheumatoid arthritis and cancer have a lot in common including medications. Yes they do, she said. They both are auto-immune diseases.