Can chronic fissures cause fistula how can i avoid that ?

Risk increases: With chronic fissures, you would be more at risk to develop a possible fistula than a person without chronic fissures. Get the fissure treated and controlled, and your risk would decrease of any possible fistula formation. Other than that, there is not much else you can do. Be well, best wishes.

Yes: Every so often I find a fissure/fistula complex. Usually the fistula is very superficial and easy to treat surgically. How to avoid it? Fix the fissure. All best!