Every time when I start running in pe my lower right abdomen hurts? I'm a guy.

Strained a mm prob. Guy, most likely you are repeatedly straining an abdominal/pelvic muscle. Pe: is that physical education, or are u referring that question to dr. Pete-:? If you repeatedly strain a muscle down there, you are heading for a hernia, which would make the strain (tearing of a small number of muscle fibers) into a hernia (permanently tearing a muscle). "walk, don't run" (check this song out).