Reversibility Outcome is related to the extent and duration of<unk>  exposure. Effects of<unk>  on the physiology of the kidneys and blood are generally reversible; its effects on the central nervous system are not. While peripheral effects in adults often go away when<unk>  exposure ceases, evidence suggests that most of<unk> 's effects on a child's central nervous system are irreversible. Children with<unk>  may thus have adverse health, cognitive, and behavioral effects that follow them into adulthood. Encephalopathy<unk>  encephalopathy is a medical emergency and causes permanent brain damage in 70–80% of children affected by it, even those that receive the best treatment. The mortality rate for people who develop cerebral involvement is about 25%, and of those who survive who had<unk>  encephalopathy symptoms by the time chelation therapy was begun, about 40% have permanent neurological problems such as cerebral palsy. Long-term Exposure to<unk>  may also decrease lifespan and have health effects in the long term. Death rates from a variety of causes have been found to be higher in people with elevated blood<unk>  levels; these include cancer, stroke, and heart disease, and general death rates from all causes.<unk>  is considered a possible human carcinogen based on evidence from animal studies. Evidence also suggests that age-related mental decline and psychiatric symptoms are correlated with<unk>  exposure. Cumulative exposure over a prolonged period may have a more important effect on some aspects of health than recent exposure. Some health effects, such as high blood pressure, are only significant risks when<unk>  exposure is prolonged (over about one year). Furthermore, the neurological effects of<unk>  exposure have been shown to be exacerbated and long lasting in low income children in comparison to those of higher economic standing. This does not imply that being wealthy can prevent<unk>  from causing long-term mental health issues.
Lead poisoning
Anxiety disorder
Mercury poisoning
Iron-deficiency anemia
Zinc toxicity
Malabsorption
Iron poisoning
Polyneuropathy