I'm an incarcerated 58 yr old white male and long-time vegetarian. For several months now, I've had periodic low-grade but constant pain in my left side around just under my rib cage area. I don't know of any organ there, but I'm drinking about 2 liters of water daily because drinking a high volume of water seems to be the only thing that helps me lessen the pain. My diet is bad here because they first allowed me a lot of soy, beans, cabbage, eggs, and rice on a completely vegan diet with no dairy. Then they took away my vegan diet and are trying to make me eat a meat diet. I can't do that so, I'm having a poor diet of a plateful of whatever vegetable (mostly potatoes, some beans, cabbage, salad, etc) is on the menu for that day and water. I'm losing weight too, but I don't notice the pain increasing with any particular food. It is just there, but I do know it is not kidney stones or diverticulis. What can it be?