**2. Incidence**

The incidence of thromboembolism in patients with thalassemia diseases is between 1.7 and 9.2% [4, 10, 11]; therefore, the incidence of thromboembolism in patients with thalassemia diseases is approximately 10 times higher than normal population [6]. The incidence is 4.4 times more prevalent in patients with NTDT than ones with TDT [10]. However, this complication could be seen in both patients alpha- and beta-thalassemia diseases [4].
