Mariners' Pitcher Bryce Miller Dealing with Side Inflammation

Pitcher receives PRP injection, will be shut down from throwing for 5 days

Mar. 3, 2026 at 5:23am

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Mariners pitcher Bryce Miller is dealing with inflammation in his left side after pitching in a Cactus League game against the Cleveland Guardians on Thursday. An MRI confirmed the inflammation, and Miller received a platelet-rich plasma (PRP) injection on Saturday. He will now be shut down from throwing for five days, after which he will begin a light throwing program as he works to return to the mound.

Why it matters

Bryce Miller was expected to be a key part of the Mariners' starting rotation this season, so any injury setback could impact the team's pitching depth and playoff aspirations. The Mariners will need to carefully manage Miller's recovery to ensure he is healthy and ready to contribute when the regular season begins.

The details

After reporting soreness following his Cactus League outing, Miller underwent an MRI that confirmed the presence of inflammation in his left side. The Mariners' medical staff decided the best course of action was to administer a PRP injection, which is designed to help accelerate the healing process. Miller will now be shut down from throwing for five days before gradually working his way back into a throwing program.

  • On Thursday, Miller pitched in a Cactus League game against the Cleveland Guardians.
  • On Saturday, Miller received a platelet-rich plasma (PRP) injection to treat the inflammation.
  • For the next 5 days, Miller will be shut down from throwing.

The players

Bryce Miller

A pitcher for the Seattle Mariners who is dealing with left side inflammation.

Seattle Mariners

The Major League Baseball team that Bryce Miller plays for, based in Seattle, Washington.

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What they’re saying

“Miller reported soreness after pitching in Thursday's Cactus League game against Cleveland, and an MRI later confirmed inflammation.”

— Shannon Drayer, Reporter

What’s next

After the 5-day shutdown, Miller will begin a light throwing program as he works to return to the mound and rejoin the Mariners' starting rotation.

The takeaway

This injury setback for Bryce Miller is an early challenge for the Mariners as they prepare for the upcoming season. The team will need to carefully monitor Miller's recovery to ensure he is healthy and ready to contribute when the regular season begins.