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.
Neck pain can be caused by: An activity that harms the neck. An injury. Another medical condition. Activities that cause neck pain. Most neck pain is caused by activities that involve repeated or prolonged movements of the neck. This can result in a strain (an overstretched or overused muscle), a sprain (injury to a ligament), or a spasm of the neck muscles. These activities include: Holding your head in a forward or odd position for long periods of time while working, reading, watching TV, or talking on the telephone.