<s>[INST] I have been experiencing a heavy feeling in my upper left abdomen that I notice when I lay down at night. If I am lying on my right side, the heavy feeling in my left side will be uncomfortable enough for me to roll over to that side, where I don t notice the heaviness as much. If I roll over during the night and my left side is again on the upper side of my body, the discomfort will sometimes wake me. I have also been experiencing some pain in my legs. Could this just be poor circulation or could the two symptoms be related? Thank you for your help. Sabrina [/INST] Hi.Thanks for your query and an elucidate history.You have a classical history of heaviness on the left upper side of the abdomen getting enhanced on turning to right side. The most probable causes can be :Severe colitis of the left side of the colon also called the descending colon;Hydronephrosis of the left kidney;Mass on the left side. I would advise you the following:Get an ultrasonography of the abdomen ,Standing X-ray of the abdomen,Colonoscopy.The treatment will depend upon the findings. </s>