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.
The main cause of neck pain is tension. During periods of intense anxiety, your muscles tense up dramatically. Muscle tension tightens the muscles, especially in the shoulders, back, and neck. The more anxiety you experience, the more your tension may cause significant pain and discomfort. A related issue comes from the mindset of those with anxiety. Many people get muscle tension in their neck during times of stress.
The locking or crick in neck muscles occurs because all of these actions, and many more during the course of a common day, can apply unexpected pressure on a nerve in the neck as it emerges from the spine. 1  The primary ways a pinched nerve in the neck can happen are: 1  Strain of soft tissue (tendon, ligament, muscle) in the neck that protects the spine. 2  Excessive movement or slight slippage of a spinal bone resulting in pinched nerve. 3  Bulging or tearing of disc tissue. 4  Aggravation of neck arthritis.