Talk to Gastroenterologist on Constipation

Aoa I go to bathroom daily but I face hard stools in my bowel routine and I think because of this I can't gain weight despite I eating a lot and my weight still that which is 4 to 5 years back and I can't gain weight even a little and i think its because of constipation(hard stools) and one thing that makes me really uncomfortable that because of this my face look very dull and my nose got swollen that is more hurtful for me so plz help me in this regard and I also think that some medicines you take is temporary relief when you drop that your stools got hard again and stomach situation getting more worst I think that I want natural way or may be any other method that cure my problem permanently and I gain weight and my skin look ok and my nose never got swollen like healthy people