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South Korea's spy agency said Tuesday it has solved the mystery of North Korean leader Kim Jong Un's 6-week public absence, which set off a frenzy of wild speculation around the world, The Associated Press reported.

The National Intelligence Service told legislators that a foreign doctor operated on Kim in September or October to remove a cyst from his right ankle, according to Park Byeong-seok, an aide for opposition lawmaker Shin Kyung-min. The aide said the spy agency also told lawmakers in a closed-door briefing that the cyst could recur because of Kim's obesity, smoking and heavy public schedule.

After last being seen in state media on Sept. 3, Kim reappeared on Oct. 14 hobbling with a cane, but smiling and looking thinner. The speculation during his absence was particularly intense because of the Kim family's importance to impoverished, nuclear-armed North Korea. The family has ruled the country since its founding in 1948.

Lim Dae-seong, an aide to ruling party lawmaker Lee Cheol-woo, who also attended the briefing, said the spy agency identified Kim's condition as tarsal tunnel syndrome.

The syndrome, which is often painful, is caused by the compression of a nerve, sometimes because of a cyst. Surgery is generally seen as a last resort after other treatments are unsuccessful.

No weight should be put on the foot for 10 days after an operation, and an improvement in symptoms may take two to three months, according to the website of the NYU Langone Medical Center's Department of Neurosurgery.