Hello. I am nearly 13 years old and for about a week have felt this odd discomforting yet not painful feeling in my upper left abdomen. I am sure it is not menstrual cramps. I have also been constipated, but the discomfort in my abdomen is what really concerns me. Please help.

It could be 100 things, no one online can tell. You will need to have it checked by a medical professional in person to find out what is wrong.