The 6 Villains Capable Of Breaking Captain Americaâs Shield. Captain Americaâs shield is a classic emblem, a near-indestructible aspect of the suspect that may well survive the Captain himself.
Lower back pain can be caused by a variety of problems with any parts of the complex, interconnected network of spinal muscles, nerves, bones, discs or tendons in the lumbar spine. Typical sources of low back pain include: 1  The large nerve roots in the low back that go to the legs may be irritated.
Often, the cause is difficult to determine. Acute low back pain lasts from a few days to a few weeks, according to the National Institute of Neurological Disorders and Stroke (NINDS). Most acute back pain is caused by a back injury or a degenerative condition such as arthritis.