Lower back pain, i'm 41 year old femaile with lower back pain, i never had back pain it hurts when i try to stand up after sitting down for a period of time

Low : Low back pain can be caused by a variety of ailments. The most typical is muscular or skeletal back pain. Arthritis of the back can be a cause, as can muscle strain. Usually low back pain is helped by anti-inflammatory medication such as Ibuprofen or Acetaminophen (if you don't have reasons that you can't take those medications). Don't lift over 10 pounds, and try to limit sitting, as that can aggravate your back. If you have increased pain, pain down your legs, any numbness/weakness or loss of bladder or bowel control, or any other kidney or abdominal symptoms, then you must be medically evaluated.

Different causes: If the pain doesn't go down your legs then it is unlikely to be a disc related problem. Other possibilities include facet joint arthritis, the beginning of spinal stenosis or arthritis due to other causes. If the pain gets worse, is associated with fever or chills, vision changes you need some intensive testing. If not consider some otc analgesics like aleve (naproxen).