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.
What causes the tightness or shortening of the neck muscle? Some times a traumatic birth injury causes stretching and scaring of the neck muscle. Congenital infant torticollis can also be caused by babyâs position in the womb. Torticollis is more common in situations where there is lack of space in the womb. For example with multiple births or when there is little amniotic fluid.