Koreans like hot and spicy food so it's not surprising then if some of them are having trouble when they go to the bathroom. They suffer with constipation. Others including young generations have some stomach disease that can cause cancer. I guess it's because of the food that they intake.
According to wikipedia, Constipation, costiveness, or irregularity, is a condition of the digestive system in which a person (or animal) experiences hard feces that are difficult to expel. In Korean it is called Byeonbi. I watched too much tv and I sometimes get some issue about health. I found out that long time ago in Korea, when people have constipation, they cooked honey and make a round shape and put in the anus or dip dodeog in oil and push it gently to the anus. Ouch! The Korean Traditional doctor said it's true but dangerous if you don't know how to do it. So don't do it if your not an expert or else your disease will get more serious.
To heal constipation, eat enough fruits and vegetables everyday. Drink a lot of water and do some exercise. I heard bananas and plums are also good for constipation. Or try this tomato milkshake or fruits and vegetables milkshake that I make for our breakfast.