Does Tight Foreskin Cause Illness?

Absolutely not!  The only problem is if it is too tight to roll back but not tight enough to cover the knob completely at all times.  Then, with part of the knob exposed with an erection, the knob can stretch or even split the tight part of the foreskin - very painful.  But if there is only a small opening in the foreskin with the knob completely covered at all times, with proper hygiene there is no problem at all.  Climax may be a bit slower, but the feeling of being contained,stimulatingthe inner skin and knob through the foreskin is delicious.  Even with the tightest skin, hygiene should not be a problem, just get soapless water get in, hold the foreskin shut, and swish the water around inside.