What heart condition was Ronaldo diagnosed with as a teenager?

As a teenager, Cristiano Ronaldo was diagnosed with tachycardia, a condition involving an unusually rapid heartbeat.

The diagnosis came during his formative years at Sporting CP, when he was still developing in the club’s youth system. Because he was already pursuing elite football, the condition threatened to interrupt—or potentially end—his emerging career. It was not merely a routine complaint for a young player training at high intensity.

Ronaldo underwent cardiac ablation to treat the problem. The procedure targeted abnormal electrical pathways in the heart. His recovery was remarkably quick: he was discharged within hours and returned to training a few days later, allowing his football development to continue.

The answer is sometimes confused with “arrhythmia,” which is a broad term for an irregular heartbeat and can include different rhythm problems. “Bradycardia” means an abnormally slow heart rate, the opposite of tachycardia. In Ronaldo’s case, tachycardia is the specific diagnosis traditionally cited in accounts of his early career.