Thanh is being treated at a medical centre while his son is being looked after by his nephew Ho Ven Bien.
"My uncle doesn't understand much of what is said to him, and he doesn't want to eat or even drink water," Bien told dpa.
"He's very sad. He doesn't say anything now," he said. "We know he wants to escape my house to go back to the forest so we have to keep an eye on him now."
Hoang Anh Ngoc, chairman of the district, said local authorities had visited Thanh at the medical centre and given him food.
"I asked officials to keep a close eye on the two men to make sure they don't escape back into the forest," he told dpa.
The discovery has shaken the small community which thought the two men dead.
"No one could imagine Thanh and his son could live 40 years in isolation in the hard conditions of the jungle" said villager Ho Van Xanh.
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