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.
The cause of the low back pain in interstitial cystitis is not from the kidneys rather it likely related to increased sensitivity of the nerves that supply that area of the back, just as pain from the bladder is related to increased sensitivity of the nerves that supply the bladder.