Do you think it is very probable that having fried fish and potatoes cause hemorrhoids if eaten with no salad?

Indeed: Fruits and vegetables as well as an active life will prevent constipation the main reason to develop hemorrhoids. The condition has a very low incidence in the third world as the consumed food has a lot a fiber. See a nutritionist to be guided properly to embark on a healthy food habits!

Hemorrhoids.: A longstanding habit of eating low-fiber meals and therefore straining at stools will contribute to production of hemorrhoids. What you listed is one example of this type of eating habit.