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| Inherited |
| Protein S deficiency |
| Protein C deficiency |
| Antithrombin III deficiency |
| Prothrombin 20210 gene mutation |
| Factor V Leiden mutation |
| Acquired |
| Myeloproliferative disorders (polycythaemia vera, myelofibrosis, thrombocythaemia), JAK2 mutation (V617F) |
| Paroxysmal nocturnal haemoglobinuria (PNH) |
| Antiphospholipid syndrome |
| Hyperhomocysteinaemia |
| Increased factor VIII levels |
| Thrombin-activatable fibrinolysis inhibitor (TAFI) gene mutation |
