-I've been having a gradual lower back pain that started out as a minor backache but now it's spread throughout my entire lower back. It hurts to bend over, especially when I bend my neck and waist. Sitting down is more painful than walking.
-I also don't do any physical labor and I am not pregnant. I have no idea what caused the pain.
There are many things that can cause lower back pain. In musculoskeletal terms, back pain is very common. Over 90% of people will have at least one significant backache in their lifetime. These are usually self limiting, with only minimal intervention. Keeping your core (postural) muscles strong, maintaining cardiovascular fitness, maintaining a proper weight, massage, hot tub, pool exercises, OTC medicines, and advoidance of bedrest, is usually all that is needed.
However, not all back pain comes from the spine. Certain abdominal and pelvic disorders can cause discomfort in the lower back. Problems with the renal system and GI tract have both been known to cause referred pain to the lumbar region. In general terms, infections, metabolic disorders, neurologic dysfunction, autoimmune disorders, and a whole host of other things can cause diffuse, nondescript back pain.
If the discomfort continues, interferes with daily activities, or the symptoms get worse, you should probably see a physician who can do a thorough history and physical examination.