Hi and welcome to Healthcaremagic. Thank you for your query. I am Dr. Rommstein, I understand your concerns and I will try to help you as much as I can. It cant be harmful for health unless there is some organic obstruction. Otherwise, if it lasts for up to 7 days, it wont have any bad effects if this improves after this time. In future. you should try with changing lifestyle and dietary habits. You need to increase fiber intake. Good fiber sources include bran and other whole grains found in cereals, breads, and brown rice, vegetables such as brussels sprouts, carrots, and asparagus, Fresh fruits, or dried fruits such as raisins, apricots, and prunes Beans. Also, you should exercise regularly. Moving your body will keep your bowels moving, too. Second, you may at times need to try a laxative. If your teen has constipation problems, talk to your teen s doctor before trying laxatives. In cases of prolonged constipation, you should do colonoscopy to rule out some other underlying cause. I hope I have answered you query. If you have any further questions you can contact us in every time. Kindly regards. Wish you a good health. DR. Ivan Rommstein