Tabriz University of Medical Sciences Journal of Research in Clinical Medicine 2717-0616 7 4 2019 12 20 Seasonal variations and the risk of venous thromboembolism: A narrative review article 105 109 10.15171/jarcm.2019.020 EN Reza Hajizadeh https://orcid.org/0000-0002-3458-3297 Hanieh Sakha https://orcid.org/0000-0001-7957-811X Sahar Ghodratizadeh Ali Soleimany Journal Article 10.15171/jarcm.2019.020 2019 10 31 2019 11 16 Different investigations on seasonal variations of the pulmonary thromboembolism and deep vein thrombosis (DVT) incidence have not yielded a definite conclusion. Some papers showed significant increase in incidence of thromboembolism in winter; on the other hand, others neglected that correlation. Some articles have tried to show infrastructure of these variations. Better understanding of the cornerstone of these variations can result in prevention of disease and saving lives of susceptible people. In this narrative review article, we reviewed previous articles according to the region of study and tried to find the factors affecting diverse results among different studies.