According to Seaward, a major factor in causing stress-related illnesses is:

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Seaward identifies irrational and negative thinking as a major factor in causing stress-related illnesses. Living in unhygienic conditions and exposure to germs may contribute to other types of illnesses, but not necessarily stress-related illnesses. The rise of sexually transmitted infections may also contribute to overall health concerns, but is not directly linked to stress-related illnesses.

According to Seaward, a Major Factor in Causing Stress-Related Illnesses