Table 2: Signs and symptoms of MeHg poisoning.

Lower level exposures
 Sleep disturbance
 Headache
 Fatigue
 Difficulty concentrating
 Depression
 Memory loss
 Diminished fine motor coordination
 Muscle and joint pain
 Gastrointestinal upset
 Hair thinning
 Heart rate disturbance
 Hypertension
 Tremor
 Numbness or tingling around the mouth

Highest level exposures
 Numbness or tingling in hands and feet
 Clumsy gait, difficulty walking (ataxia)
 Slurred speech
 Tunnel vision
 Diminished visual acuity