North Korea's state media, which usually chronicle Kim's activities in great detail, have not mentioned any public appearances since he attended a concert with his wife on Sept. 3 and the official KCNA news agency indicated he did not attend an important political anniversary on Friday.
In the previous two years, Kim marked the anniversary of the founding of North Korea's Workers' Party with a post-midnight visit to the Pyongyang mausoleum where the bodies of his father and grandfather are interred.
But the report by KCNA did not mention Kim's name in a list of high-level party and military officials who attended an event at the mausoleum on Friday. A flower basket from Kim was placed at the mausoleum, it said.
The source with access to the North's leadership, who has close ties to Pyongyang and Beijing, said on Thursday that Kim had hurt his leg while inspecting military exercises.
"He ordered all the generals to take part in drills and he took part too. They were crawling and running and rolling around, and he pulled a tendon," the source told Reuters on condition of anonymity.
"He injured his ankle and knee around late August or early September while drilling because he is overweight. He limped around in the beginning but the injury worsened," the source said.
Kim, who has rapidly gained weight since coming to power after his father died of a heart attack in 2011, had been seen walking with a limp since an event with important officials in July, which would imply he may have aggravated an earlier injury.
Kim needs about 100 days to recuperate, said the source, whose information could not be independently verified.
"Kim Jong Un is in total control," said the source.
Kim's absence from public view is fuelling speculation over the state of his health and whether he may have been sidelined in a power struggle.
"The longer he remains out of the public eye, the more uncertainty about him, and the status of his regime, will grow," said Curtis Melvin, a researcher at the U.S.-Korea Institute at the Johns Hopkins School of Advanced International Studies in Washington.

Latest News from World News Desk