Objective: Investigation of the clinical characteristics of patients with occult malignancies identified within 1 month after symptomatic venous thromboembolism (VTE) diagnosis. Methods: Twenty-three patients (4.8% of symptomatic VTE cases) whose malignancies were diagnosed within 1 month after VTE between April 2019 and March 2025 were retrospectively analyzed. Results: The ovary was the most frequent primary site of identified malignancies (n=6). 43.5% of patients were identified at Stage IV, while 26.1% were at Stage I. In three of the Stage I cases, venous compression by the tumor appeared to contribute to VTE onset. Sixteen patients (69.6%) received active treatment for their malignancies, including surgery, chemotherapy, and radiotherapy. Conclusion: Approximately 5% of patients with symptomatic VTE were found to have occult malignancy within 1 month after diagnosis. Careful imaging evaluation and clinical assessment at the time of VTE diagnosis may facilitate early detection of occult malignancy.