I am severely underweight, and I have had trouble gaining any since I was 13 years old. Here I am, a 5'3" 19-year old male at 68 pounds! I've never lost any, but I haven't been able to gain as I grew. With my IBS, I cannot handle eating the amount I need to gain weight (though I can manage to maintain). Anyway, one doctor suggested I may want to consider a J-tube or G-tube that goes directly into the stomach (G-tube) or small intestine (J-tube). I would only use it to get up to a normal weight and could resume my current eating habits after a few months when I gained enough.I liked the idea that I would not need to stay overnight or any extended period at a hospital. Also, I wouldn't be confined to a bed or be an invalid. Anyway, I am sure there are downsides. Does ANYONE have any experience with these tube things? Also, the doctor only mentioned the G-tube. Does the J-tube pose more risks, problems or pain? It sounded better since I might not feel the fullness or bloating. Does a person still feel "full" from a G-tube? (If so, that one would seem pointless.)I do plan to talk to a specialist about it when I can get an appointment, but would appreciate any personal experience or input.