Which of the following is NOT a sign of chemical exposure?

While headaches can occur for a variety of reasons, they are not a definitive or specific sign of chemical exposure. Symptoms of chemical exposure typically involve reactions directly linked to inhalation, ingestion, or skin contact with hazardous materials. These symptoms often manifest as physical or neurological effects that are more characteristic of direct exposure to chemicals.

In contrast, a rash is often a visible reaction illustrating skin exposure. Difficulty breathing signifies respiratory effects that can arise from inhaling toxic substances, and confusion can indicate neurological impact resulting from brain exposure to harmful chemicals. Each of these symptoms has strong associations with specific types of chemical exposure, while a headache could arise from numerous other non-chemical-related issues. Understanding these distinctions is crucial in identifying and responding to hazardous material incidents effectively.