Causes of ADHD-Hyperactivity
Although causes are unknown and still being researched, researchers have found that causes are environmental and genetic.
Genetic:
Studies on twins have found that ADHD is genetic and more specific studies are taking place to help researchers find which specific genes are associated with ADHD.
Environmental:
Studies have found a link between ADHD and smoking or drinking during pregnancy. Also, researchers have found that preschoolers that are exposed to lead are more likely to have ADHD.
("ADHD", n.d.)
Genetic:
Studies on twins have found that ADHD is genetic and more specific studies are taking place to help researchers find which specific genes are associated with ADHD.
Environmental:
Studies have found a link between ADHD and smoking or drinking during pregnancy. Also, researchers have found that preschoolers that are exposed to lead are more likely to have ADHD.
("ADHD", n.d.)