Which of the following is an early symptom of pesticide poisoning?

Headache is considered an early symptom of pesticide poisoning because it can manifest relatively soon after exposure to harmful substances, reflecting the body's immediate reaction to the toxic agents present in pesticides. This symptom may result from various factors, including the effects of the chemicals on the central nervous system, the body's inflammatory response, or even dehydration caused by nervous system overstimulation.

Understanding the timeline and severity of symptoms associated with pesticide exposure is critical. While symptoms like convulsions, difficulty breathing, and coma indicate more severe stages of poisoning and can occur later as toxicity progresses, a headache often serves as an initial warning sign that something is wrong. Recognizing and acting on early symptoms like a headache can be crucial for taking timely measures to mitigate further exposure and potential health risks.