SINGAPORE – Mr Lutfhil Hadi Azman was just 12 when he began experiencing pain in his left leg in late 2019.

The pain was intermittent, surfacing especially when he would run or walk fast. A family doctor diagnosed the pain as muscle aches, prescribing him gel and painkillers for relief.

“I thought it was just muscle pain. If I felt the pain, I would just take painkillers,” said Mr Hadi, who is now 19.