Some of the most common heavy metals that led to poisoning in the human body are lead, cadmium, arsenic and mercury. In India, some of the sources of exposure to lead include old water pipes, stained glass, jewelry, cheap toys, and some traditional herbal medicines. Children are especially vulnerable to lead toxicity as opposed to adults. Even the smallest concentration of exposure to lead is known to cause irreversible brain damage, intellectual disability, attention deficit and hyperactivity disorders, behavioral problems, violence, and anti-social behavior among children
Apart from genetics and environmental factors, the most common causes and risk factors relative to mental disorders can be attributed to lifestyle. For instance, poor nutrition could deplete the body of vital minerals and vitamins that in turn, could increase the vulnerability for mental health disorders. In addition, stressful life events such as grief and loss of a loved one and substance abuse such as addiction to drugs and alcohol are some of the other factors that have been linked with mental illnesses.