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Frequency of symptoms associated with manganese toxicity.7
| Effects of manganese toxicity | Incidence |
|---|---|
| Headache and insomnia | 88% |
| Exaggerated tendon reflexes | 83% |
| Hyper-myotonia | 75% |
| Memory loss | 75% |
| Emotional instability | 35% |
| Tremor | 23% |
| Speech disturbances | 6% |
| Festinating gait | 3% |
