Muscle strains are also known as a pulled muscle. When the muscles in the lower back are strained or torn, the area around the muscles can become inflamed. With inflammation, the muscles can spasm leading to severe low back pain and difficulty moving.Lower back pain from a muscle strain occurs most frequently after lifting a heavy object, lifting while twisting, or a sudden movement or fall. The pain is usually localized, meaning it doesn't radiate to the leg.ith inflammation, the muscles can spasm leading to severe low back pain and difficulty moving. Lower back pain from a muscle strain occurs most frequently after lifting a heavy object, lifting while twisting, or a sudden movement or fall.