What is a symptom of lead poisoning?

Stomach aches are indeed a common symptom of lead poisoning. When lead enters the body, it can disrupt various bodily functions, particularly affecting the gastrointestinal tract. This disruption can lead to abdominal pain and discomfort, which are frequently reported by individuals suffering from lead poisoning. The presence of lead can also cause nausea and vomiting, adding to the gastrointestinal symptoms.

The other options present symptoms that, while potentially associated with various health issues, are not as specifically linked to lead poisoning. Sleep disturbances can arise from a variety of factors and are more broadly indicative of mental health and environmental factors. Increased appetite is generally not associated with lead poisoning, as it often leads to a variety of gut issues that would typically contribute to a decreased appetite. Severe headaches can be a symptom of various conditions, but they are not uniquely indicative of lead poisoning and can be attributed to many other causes.