At 79 years old I was initially diagnosed with a single high grade NMIBC which was removed via TURBT and followed by BCG treatments. One month after surgery I began a six weekly instillation of 50% BCG. Initially no side effects except temporary burning and urgency but by treatment four I was getting flu like symptoms ( body aches, headaches, nausea, fatigue etc) which lasted for 24 hrs. Regardless I finished the six treatments and three months later had three more again with progressively worse side effects, often lasting 48 hrs. Six months later I had three more treatments and had a reactive arthritis episode on the last treatment. This was a spontaneous ( within 48 hrs of the last treatment)occurrence of arthritis on my right hand, hip and knee. While my urologist wasn’t convinced it was reactive from the BCG, the rheumatologist I saw was convinced it was. We stopped the BCG treatment program at that time and opted for periodic cystoscopy to evaluate my condition. At present, I’m cancer free at present but my first 6 month evaluation is due in September, so I’m anxious to see if I’m still NED. BCG is the gold standard and I wish I had been able to continue treatment. I’m not sure what options will be available to me if they find tumors at my evaluation. Will keep u all posted.