"My mind is willing but my body is giving me trouble," Lee told the Malaysian Star.
"I am 80 percent better but every day is a struggle for me to psych myself up in training. My mood fluctuates. I get very upset when my legs give way when I try to push myself.
"I am beginning to feel the heat as it draws closer to the World Championships."
The draw for the Aug. 25-31 tournament in Copenhagen took place in Kuala Lumpur on Monday with Malaysian media talking up the chances of Lee winning a first world championship in the absence of double defending champion Lin Dan of China.
Lee lost the last two finals to his great rival Lin, the twice Olympic and five-times world champion who failed to qualify for the Denmark event.
Still, the 31-year-old Malaysian, who talked about retirement earlier this year, said the task to lift a first world title would be tough with new Commonwealth champion Kashyap Parupalli of India a likely second round opponent.
"It will not be easy. I will have to get myself motivated again," he said.
"I need to analyse all my probable opponents. I have beaten all of them, but it will be a different scenario in Copenhagen."
(Writing by Patrick Johnston; Editing by John O'Brien)
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