And he seems pretty scared about it.
The Mets suspended Reyes' spring training activitities Friday morning and are sending him back to New York for more medical tests after team doctors became worried about his blood work.
An overactive thyroid is suspected, but more won't be known until a round of tests on Monday.
UPDATE: Brian Costa of the Newark Star-Ledger spoke with the co-director of the New York Thyroid Center, who told him:
"I wouldn't think he should be inconvenienced for more than a few weeks or a month or so," Robert McConnell said. "This should have absolutely no long-term affect on his career."
Reyes had been cleared to play by a doctor on Thursday, but was scratched from the lineup of Friday's game after irregularities appeared.
Reyes, who came to camp pumped about the season after recovering from a torn hamstring, doesn't quite know what to think. He says he doesn't feel sick but he and the Mets aren't taking any chances.
Located in the front of the neck, the thyroid gland produces hormones that regulate metabolism, energy and other chemical processes. Reyes said he felt no irregular symptoms and was surprised by the test result but was nonetheless concerned.
"This is important, more important than baseball right now," Reyes said. "We're not talking about my leg. Nothing like that. We're talking about my health. That's even worse. I have to be concerned about it."
- The Mets