You didn't say anything about your state of health or your eating habits. In general, I can tell you that constiption is a common phenomenon in the modern world, usually as a result of poor eating habits. Today, people tend to eat foods that lack dietary fibers, don't exercise or drink enough. For a healthy person, these are the main causes of constipation. People who suffer from constipation do not change their lifestyle habits, instead they look for quick fix and use laxatives. Almost all laxatives will help a person overcome constipation at first, but over time, your bowels will not be able to function without them, you will need higher doses and your constipation will get worse. My advise to you is to make an appointment with a gastroenterologist to make sure that you have no other underlying causes. Afterwards, make an appointment with a dietician to help make a food plan rich with dietary fibers. Meanwhile, you should drink 12-15 cups a day and make sure to have dietary fiber-rich foods like whole grains, brown rice, fruits and vegetables.