Aims: To explore whether the phenomenology and co-morbidity of a specific phobia of vomiting (SPOV) (also known as "emetophobia") might best fit within the group of obsessive compulsive and related disorders. Method: Case review of individuals who were assessed for a SPOV (n=83). Results: Sixty-two per-cent of cases reported being markedly or very severely preoccupied by the fear that they might vomit. A majority of people with a SPOV reported either often or always conducting repetitive behaviors such as compulsive washing; reassurance seeking; self-reassurance, counting or superstitious behaviors to prevent vomiting; checking others for signs of illness or checking sell-by dates. Cases that had more frequent hand washing were associated with higher scores on standardized questionnaires for a SPOV and a later age of onset. The diagnosis of OCD formed the highest degree of comorbidity. Conclusions: The results have implications for future research into the nosology and treatment of a SPOV. Clinicians should assess for repetitive behaviors in a SPOV and include them in a formulation and treatment plan. Future research should conduct prospective studies to determine which aspects of the phenomenology of a SPOV might best fit under OC and related disorders.