Due to its low incidence in Taiwan, malignant pleural mesothelioma is seldom considered by physicians in their differential diagnosis of chest pain, especially when information about patients’ occupation and asbestos-exposure history are not obtained. This article presents a 59-year-old male, a former boiler worker with high asbestos exposure, who had recurrent chest pain with some infectious symptoms and signs in the past two years. In spite of the occurrence of unilateral pleural effusion in the early stage, biopsy was not performed to confirm mesothelioma until it rapidly progressed to stage III tumor. The physicians did not inquire into the patient’s asbestos exposure history, and his pleural effusion appeared to be remitting-relapsing, instead of the persistent and increasing manner typical of malignant pleural mesothelioma. Both factors led to the delay in his diagnosis. This case reminds physicians of the need to understand patients’ occupational and exposure history. Aggressive investigation need to be arranged for high asbestos exposure patients presenting with recurrent chest pain or remitting-relapsing pleural effusion.