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.
Most often, the spasms are caused by muscle strain from physical overexertion, muscle tension from stress or in reaction to pain at other locations, or physical overexertion from heavy lifting or strenuous exercise. For more information see neck pain causes.Muscles in the neck develop spasms that involve muscle contractions. This can result from sudden movements or twisting of the neck which puts compression on the muscle. This can cause excess stretching of the muscles which may tighten leading to pain.ost often, the spasms are caused by muscle strain from physical overexertion, muscle tension from stress or in reaction to pain at other locations, or physical overexertion from heavy lifting or strenuous exercise. For more information see neck pain causes.