weird pain on left side, what is it???

Hello
I'm not sure if anyone knows of this or has experience with a similar "sensation", but i thought I'd put it out there and ask...
i have had this weird sensation/dull feeling under my LEFT rib on and off for a couple years. I'm starting to gear up for a Liver Flush tomorrow night, and i've been cleansing/fasting all week, and today the sensation started up again. it doesn't hurt, it's not shooting pains, just noticable and annoying. i try to stretch my side to make it dissipate, or massage it, but it still persists. then it goes away again.
blockage? colon? what organ is located on the left side under the rib? it always acts up when i'm cleansing and doing colonics. i don't know if anyone will have any info., but ya never know.
my diet is 100% vegan and organic, it has been for years. i've done colonics and fasting lots too. i'm so curious what it could be..... thank you if you have any tips or advice. Tweet