An antacid is a substance which neutralizes stomach acidity, which in turn relieves heartburn.n antacid is a substance which neutralizes stomach acidity, which in turn relieves heartburn.
Hip is the region below the waist and above the thigh. It includes the buttocks (which only refers to the back muscle). It includes the flesh and internal anatomy of this area especially the bones, hence you have hip joints.
Now when we look for the differences between back pain and kidney pain based on the area of their spreading, we can say back pain spreads to back of the thigh, buttock, calf, foot and also the toes in one or both the feet. While kidney pain usually spreads to the lower abdomen, inner thigh etc.