- Infectious causes
- See Superior Vena Cava Syndrome
- Thoracic aneurysm
- Mediastinal cancer
- Thrombosis secondary to upper extremity infection
- Intraluminal metastasis secondary to hypernephroma
- Increased Capillary Permeability
- Acute nephritis
- Angioedema (Angioneurotic edema)
- Scleroderma
- Miscellaneous