Introduction. ADHD is characterized by hyperactivity and impulsive and inattentive behaviors that make daily life difficult. Its development depends on environmental and genetic factors, but it is genetics that has the greatest weight: it is estimated that it explains 74% of its variability. We are trying to analyze a recent field in the genetic development of ADHD, first of all genomic studies with the discovery of risk genes. Understanding the genetics of ADHD and its association with other pathologies will help to prevent and diagnose patients early and facilitate the search for new targeted therapies. Methodology. I have studied articles from the last 5 years published in electronic sources recognized by the international medical society as: PubMed / NCBI, Cambridge, Oxford, IBUB, studies GWAS and following the revision of the literature to understand the role of genes and molecular processes in the emergence of ADHD. Results and discussion. Have been identified 27 regions of the genome associated with ADHD, among the genes like SORCS3, FOXP1 and FOXP2. It's found genome-wide significant linkage for a region on chromosome 16 between 64 Mb and 83 Mb, evidence supporting linkage to chromosomes 4q13.2, 5q33.3, 8q11.23, 11q22, and 17p11. one region implicated LPHN3. The involvement of multiple genes like 5HTT, DAT1, DRD4, DRD5, HTR1B, BAIAP2. More than 80% of genetic variants with an effect on ADHD also influence the development of other psychiatric disorders, such as schizophrenia, major depression or autism spectrum disorder.