Suu Kyi's youngest son, Kim Aris, had said in a recent interview that he had had no contact with his mother since the military seized power in a coup in February 2021.
"For all I know, she could be dead," he told Reuters news agency.
Aung San Suu Kyi, now over 80 years old, has been held in detention since the coup and is serving multiple prison sentences handed down by military-controlled courts.
The conditions of her detention and access to medical care remain unclear, with independent verification impossible due to tight restrictions imposed by the junta.
Suu Kyi is Myanmar's most prominent democratic leader and an international symbol of resistance to military rule.
She was awarded the Nobel Peace Prize in 1991 for her non-violent struggle for democracy while under house arrest during an earlier period of military rule.
The daughter of independence hero General Aung San, she led the National League for Democracy (NLD) to a landslide election victory in 2015, becoming the country's de facto civilian leader - with the title of state counsellor - after decades of military dominance.
Following the 2021 coup, in which the military overturned the results of a general election won overwhelmingly by the NLD, Suu Kyi was arrested and later convicted on a series of charges widely condemned by international observers as politically motivated.
She has not been seen in public since her detention.
Aris has repeatedly called for his mother's release.
He has said the prolonged silence and lack of official communication have intensified his concerns as she ages.
The military has previously issued brief assurances about Aung San Suu Kyi's health but has not allowed independent observers, diplomats or family members to see her.
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