The health of Duterte, 74, and his absences from the public spotlight are often the subject of fervent speculation, and the source of complaints from critics that his administration is not forthcoming about the extent of his ailments.
Duterte had a minor fall from a motorcycle in the grounds of his palace last week, causing hip pain, light bruises and scratches on his elbow and knee.
He used a walking cane in Tokyo on Tuesday during a ceremony for Japanese Emperor Naruhito's ascendancy to the throne, but would skip a banquet to return home and see his neurologist, said presidential spokesman, Salvador Panelo.
It was the third time this month that the government has tried to allay concerns about Duterte's health after the maverick former mayor told the Filipino community in Moscow that the frequent drooping of one eyelid was due to a chronic neuromuscular disorder.
Duterte's known problems include back pain, migraines from nerve damage after a previous motorcycle accident and Barrett's oesophagus, affecting his throat.
His circulation is impacted by Buerger's disease, from heavy smoking when he was younger. He last year said he had tested negative for cancer.
His health is also watched closely because of the political uncertainty that would surround his succession should he be unable to continue.
Duterte's constitutional replacement would be Vice President Leni Robredo, a political opponent who was elected separately and was not his running mate.