Chemical
Stress

Exposure to harmful chemicals may severely irritate the nervous system, causing the neck muscles to tighten.

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The sources of chemical stress include pollutants in the air, insecticides and certain food additives and preservatives, colorants, artificial growth hormones. Harmful chemicals may be consumed, inhaled, or even absorbed when contacting the skin. Examples of chemical stress are severe headaches and nausea, to name but two.