What is one of the main causes of ADHD?

The primary cause of ADHD, or Attention-Deficit/Hyperactivity Disorder, is significantly influenced by genetic factors and heritability. Research indicates that ADHD tends to run in families, suggesting a strong hereditary component. Genetic studies have shown that variations in certain genes, particularly those involved in dopamine regulation and neurotransmitter systems, can be linked to the disorder. This hereditary aspect highlights the biological underpinnings of ADHD, making genetic factors a critical area of focus in understanding its etiology.

While environmental factors can also contribute to the development of ADHD, they are not considered the main cause. For instance, prenatal exposure to toxins or extreme stressors during critical developmental periods may play a role, but these factors alone do not capture the complexity of ADHD's origins. Aging does not directly cause ADHD; instead, the disorder typically manifests in childhood and can persist into adulthood. Similarly, excessive exercise does not have a known link to the onset or causes of ADHD, making these options less relevant in understanding the primary causes of this condition.