Active and Passive Immunity. Naturally acquired active immunity occurs when the person is exposed to a live pathogen, develops the disease, and becomes immune as a result of the primary immune response. Artificially acquired active immunity can be induced by a vaccine, a substance that contains the antigen.
Lower back tightness can cause muscle twitching, pain and reduced range of motion. Lower back muscle tightness is the cause of a muscle spasm. This can be brought on by a strain, overuse or muscle weakness, according to BetterMedicine.com.
How Tight Hips Can Cause Lower Back Pain. In my experience as a personal trainer for 5 years Iâve noticed that tight hips lead to lower back pain. I always like to use the analogy of a hammock when referring to how the body works with regard to tight muscles, connective tissue, tendons and ligaments.