Bandian Luisito Eusebio was part of a tour group to northern and central provinces.
At around 10:40 a.m., when he was touring the Hien Luong-Ben Hai national historical site in Quang Tri Province, he fell unconcious and his face turned black and blue. The man died shortly afterwards.
Reports say he had had gastric surgery. Local authorities have ordered an autopsy to identify the cause of death, but have released no further information.
Vietnam received 151,641 visitors from the Philippines last year. Filipinos, like everyone else in Southeast Asia, are allowed to visit Vietnam without a visa.