HI Thank for asking to Healthcaremagic Abdomen symptoms in this age of 17 years are pretty common particularly constipation and it is not due to any illness but eating habit diet life style could be the cause of constipation, I always advise to all of my patients those comes with such complaints, that try to have more vegetable diet (Green leafy vegetable ) fiber containing diet, drink more water, keep regular habit of defection and go for that even in absence of this no matter if you don not pass the stool still be inside sit there for a while without exerting the force for defecation, no need to be over conscious if you do not pass the tool even for couple of days, you can try stool softener like Isabgol , hope this information helps.