Lowest exposure: Impaired abilities (patients may be asymptomatic)
|
Decreased learning and memory |
Decreased verbal ability |
Early signs of hyperactivity or ADHD |
Lowered IQ |
Impaired speech and hearing functions |
Low exposure
|
Myalgia or paresthesia |
Mild fatigue |
Irritability |
Lethargy |
Occasional abdominal discomfort |
Moderate exposure
|
Arthralgia |
General fatigue |
Difficulty concentrating |
Muscular exhaustibility |
Tremor |
Headache |
Diffuse abdominal pain |
Vomiting |
Weight loss |
Constipation |
High exposure
|
Paresis or paralysis |
Encephalopathy
|
May abruptly lead to seizures, changesin consciousness, coma, and death
|
Lead line (blue-black) on gingival tissue |
Colic (intermittent, severe abdominal cramps) |