Malaysia's badminton player Lee Chong Wei reacts during a news conference in Putrajaya on Thursday. Photo: VCG

Cancer-hit badminton star Lee Chong Wei announced his retirement Thursday, ending a brilliant career in which he collected a swathe of honors but never won a world or Olympic title.

Lee, who spent a total of 348 weeks as world No.1 but lost six world and Olympic finals, wept as he called it quits months after fighting off nose ­cancer.

"My decision to retire is a heavy one. I really love this sport. But it is a demanding sport. I thank all Malaysians for the past 19 years," Lee, 36, told a news conference.

Lee, a father of two, was diagnosed with early-stage nose cancer last year and after intensive treatment in Taiwan he said he was keen to play again.

But he hasn't trained since April and after missing a series of self-imposed deadlines to return to competition, his hopes of being eligible for next year's Tokyo Olympics were remote.

The three-time Olympic silver medalist said he now wanted to rest and spend time with his family, and even take his wife on a "honeymoon," a trip that has been delayed since their marriage in 2012.

He finishes his career with 705 wins and 69 titles, including five Commonwealth Games gold medals, four All England victories and a record 47 Superseries triumphs.

Lee's unsuccessful attempts to capture Malaysia's first-ever Olympic gold medal, reaching three consecutive ­finals, were followed avidly by his fans, as was his long-running rivalry with ­Chinese superstar Lin Dan.

His last shot at the Olympic title at Rio 2016 ended in crushing disappointment when the Malaysian lost out to China's Chen Long in a nail-biting final.

Lin posted to his 4 million followers on China's Twitter-like Weibo, "I will be alone on the [badminton] court and no one will accompany me."

He also posted a link to a Chinese ­ballad called "Friends Don't Cry."

"Lin Dan and myself are rivals in the court but outside the court, we are close friends," Lee said when asked about their rivalry.

"I hope Lin Dan will play in the Tokyo Olympics. But he faces challenges from younger players."

Cancer proved the career-ending blow but it wasn't the only low for Lee, who was banned after testing positive for a banned anti-inflammatory at the 2014 world championships.

The longtime former world No.1 ­returned to the sport in 2015, after authorities accepted he took the drug inadvertently.

"I have no regrets. More important is my health, the decision to retire is very tough," said Lee, adding that his cancer treatment was now over.

"My plan to retire was originally after the Olympic Games. I made this decision due to my health.

"You know I got married in 2012. But we [have] never gone for a honeymoon. I owe this promise [to my wife], now I have to please her."