(WFLA) – To look at 10-year-old Addison Street, you would never know she had a heart condition.

It first appeared when she was only six-years-old.

“I started feeling a little pressure and I started feeling nauseous,” Addison said.

Her heart rate skyrocketed.

She was diagnosed with supraventricular tachycardia at Johns Hopkins All Children’s Hospital, a fancy word for an abnormally fast heartbeat.

News Channel 8’s Stacie Schaible has much more on Addison and her story in the video above.To sign up for Stacie’s 2017 Tampa Bay Heart Walk team, click this link.

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