Lowest exposure: Impaired abilities (patients may be asymptomatic) |
- Learning and behavior problems
- Lowered IQ
- Early signs of hyperactivity or ADHD
- Slowed growth and development
- Hearing and speech problems
|
Low exposure |
- Myalgia or paresthesia
- Mild fatigue
- Irritability
- Lethargy
- Occasional abdominal discomfort
|
Moderate exposure |
- Fatigue
- Difficulty concentrating
- Tremor
- Headache
- Diffuse abdominal pain
- Vomiting
- Weight loss
- Constipation
|
High exposure |
- Motor neuropathy (more common in adults)
- Encephalopathy
- May abruptly lead to seizures, altered mental status, coma, and death
- Burton line (blue-black) on gingival tissue
- Colic (intermittent, severe abdominal cramps)
|