Often when I eat spicy/hot foods I have a bowel movement later it comes out just as hot & very painful. Is there a reason for this/way to avoid this?

Avoid spicy foods. Sometimes this can be from active hemorrhoids or the medical condition pruritus ani. Spicy foods often have an ingredient capsaicin which can set off the p nerve fibers in the body. It seems that some people have more sensitive nerve fibers in their body and the capsaicin found in hot peppers triggers this.