Because lead poisoning is common and the symptoms are vague, health professionals may consider testing blood lead levels when the conditions listed below do not have a clear-cut cause.

• Developmental delays and learning disabilities, especially in children
• Anemia, which can cause paleness, fatigue, and weakness
• Chronic abdominal pain or digestive disorders, such as gastroenteritis
• Mood disorders, such as depression
• Hypothyroidism, which can cause fatigue, memory problems, and depression