The lower back bears most of the body’s weight and can be easily injured when you lift, reach, or twist. Pain in the lower back may come from the spine, back muscles, nerves, or other structures in the surrounding region. It may also radiate from problems in different regions, like the mid and upper back, a hernia in the groin, or issues in the ovaries/testicles. It may not be one action that causes pain in the back. Doing many things improperly over time, like sitting, standing, and lifting, may lead your back to be injured when you do something simple like bending down to pick up a dropped pencil.