This research identified psychosocial factors associated with post-traumatic stress and health anxiety following a venous thrombotic embolism. In all, 158 participants, largely registered with a venous thrombotic embolism information website (Lifeblood: The Thrombosis Charity), completed an online survey. Post-traumatic symptom scores were linked to health threat, and not moderated by perceived control over risk for further venous thrombotic embolism. Health anxiety was associated with continuing symptoms and a negative emotional response to the venous thrombotic embolism. There is a need to intervene to reduce both short- and long-term distress in this population, ideally using a stepped-care model.