Familial mediterranean fever (FMF) is an hereditary disease transmitted in an autosomal recessive way and characterized by recurrent and brief episodes of fever and pain secondary to serositis. The pain is usually located in abdomen simulating an acute abdomen, and in thorax in the form of pleuritic pain. The most severe complication of the FMF is the development of amyloidosis being the main cause of death. This illness affects an specific ethnic group of the mediterranean area, but the prevalence in our area is low. We present the case of a 30 years old man with recurrent thoracic and abdominal pain, whose final diagnostic was FMF. Insisting on the difficulty that it was recognize this proper illness.