I got sick all the time on it but I have always been prone to colds. Have had lifelong sinus allergies which don’t help. But I will say it seemed to make me more susceptible to stress damaging my body. For example after a really stressful month at work I got mono. I was in my 30s, who gets mono that late in life? At one point I lost my job and was extremely stressed- that’s when the eye floaters arrived. Years later tinnitus started soon after a death in the family. I realize I could be just be fishing around here, but it seemed like more “serious” things happened to me when I was on fin, rather than just getting laid up for a few days.