[Diagnosis of cannabinoid hyperemesis : update on the cannabis-shower syndrome].

Sometimes, the emergency department is confronted with cases of repetitive vomiting and abdominal pain without organic causes. These patients come back again and again for this problem. All diagnostic tests are systematically negative. A well conducted history taking reveals a chronic cannabis addiction and the disappearance of symptomatology by taking hot showers. This presentation is pathognomonic of the cannabinoid hyperemesis syndrome.