Sounds like back strain. If you haven't been lifting anything recently, or if you haven't fallen recently, then it could be a kidney infection. See you doctor.
Back pain lower right side causes are: Lower back and kidney disorders.
Pulsating sprinkler tangles back and forth as it rotates to water across your lawn. This has a standardized faucet connected to the opening close to the bottom of the metal or plastic. Two or more pulsating sprinkler can be connected together using numbers of water hoses.
The loins are the sides between the lower ribs and pelvis, and the lower part of the back.......
Kidney pain typically manifests in the lower back, either on one side or both sides. It can also radiate to the sides, abdomen, or groin area. In some cases, kidney pain may be felt as a dull ache or sharp pain.
You could have a slipt disc in your lower back, they are very painful.
r'patz is tickalish on the sides of his stomach and lower back and ?
Have your gall bladder checked.
sciatica
Pain in lower right and/or left sides.
One can find information about the causes of lower back pain from the following sites; Chronic pain site, WebMD, Mayo clinic, Bupa, Health guide, and NHS.
Possible causes of lower back pain that can result in the inability to lift the leg include herniated discs, sciatica, spinal stenosis, and muscle strains.
Possible causes of lower back pain when lifting your leg while sitting include muscle strain, herniated disc, sciatica, or spinal stenosis.