Five years ago, when she was a 21-year-old student, Lee Mun Ling came down with a niggling flu that wouldn’t go away – a rare occurrence as she seldom fell sick.

At the hospital, the doctors suspected dengue fever and so a blood test was carried out. The results were negative for dengue, but they uncovered other problems.

For one, her blood pressure was sky-high even though she had no heart disease. Also, her heart rate was through the roof. Alarmed, the doctors put her in the trauma ward and performed more tests.