I have a new within the hour pain in my lower left back accompanied by a warm-to-the-touch feeling. i did not injure or otherwise provoke this.

Low back pain: The description of the low back pain is nonspecific. If it's affected by bending a musculoskeletal origin is likely. If there is radiation of pain toward the groin, a kidney stone may be the cause. Any urinary symptoms? If it's a musculoskeletal discomfort, apply ice, and take an anti-inflammatory medication like Advil or Aleve. If symptoms persist see your physician or an orthopedic specialist.