Toxic heavy metals are widely available in the surrounding environment, family units, and work environments and drinking water and defile food. The interaction between ecological exposure to toxic heavy metals and human infections is oftentimes depicted. The poisonous system of activity is traditionally seen as the capacity to deregulate the redox status, creation of incendiary middle people and adjustment of mitochondrial work. As of late, developing proof demonstrated that metals may apply their poisonousness through microRNAs (miRNA) that work as negative/positive controllers of expression of genes. Atypical modification of miRNA is straightforwardly involved in different patho and physiological circumstances and flagging signaling, thus prompting various sorts of malignancy and human illnesses. Also, the quality administrative limit of miRNAs is especially important in the cerebrum-an unpredictable organ with neurons showing a huge capacity to adjust following natural boosts.This book will enormously accentuate the impact of the toxic metals on miRNA exercises and how this adds to movement of illnesses, for example, malignancy and neuro-degenerative issues.