According to Virsho triad, the blood stasis plays an important role in venous thrombosis, and it seems that their height affects the risk of venous thrombosis. For this reason, considering the pressure difference between the upper and the lower extremities, to assess the relationship between height and the risk of DVT in a case - control study, we have devoted this study. In a study conducted in two groups of 70 patients, with upper extremity DVT (30 patients) and chronic DVT (40 patients) and 50 control groups were examined. The two groups of case and control were matched in terms of age and gender, and questionnaires were completed for each of the groups based on the contents of the records and documents. This information includes age, gender, height, weight, location of DVT (proximal or distal of food and the proximal or distal of hand), respectively. After removal of confounding factors, in the study of the height difference between the study groups, the difference between the control group (9.87 ± 165.12) compared to DVT group (8.03 ± 169.48) was statistically significant (P = 0.009). In the study of height differences in varied groups, the height differences among patients with upper extremity DVT, (7.78 ± 165.23) compared to lower extremity DVT (6.68 ± 172.67) was statistically significant (P <0.001). The height difference between the control groups was statistically significant compared to DVT groups. The height differences between the patients with upper extremity DVT compared to lower extremity DVT was significant.