Any explanation for why i get liver pain every single time i run?

Probably not liver: The liver is an organ in the upper right abdomen. The cause of true liver pain is expansion of the liver capsule such as when a liver tumor expands rapidly. The other causes of pain in the region of the liver are hepatic flexure syndrome where gas accumulates there and produces gas pain possibly from running or gall bladder pain. The gall bladder may have small stones which pass to cause pain.