I have had an ache in my left side for about 4 months...it's persistent. My doctor took stool samples and blood samples. All came back normal. Then is ran a CT scan which indicated a 1.2 cm mass in the lower stomach lining. He then performed a PET scan over my entire body including the mass, and that came back normal. He said not to worry about it and maybe to perform another CT scan in a few months. In the meantime the ache is still present. Anyone out there have a similar story and idea about the pain. Thanks....spreen