It wasn’t a question of performance in Thursday night’s Miami Dolphins football game, but whether or not the team’s quarterback Tua Tagovailoa should have been playing at all, just days after suffering a concussion.

Tagovailoa was taken off the field on a stretcher in the second quarter after being sacked, a play that caused another serious hit to the head that the coach later confirmed to be his second concussion in five days.

While the Dolphins coach said Tagovailoa had been cleared to play, Joseph Bautista, DO, a family medicine and sports medicine specialist with the Hartford HealthCare Medical Group, says it may have been too soon.

“One of the main goals of the return-to-play protocol is to avoid second impact syndrome, a condition in which an athlete sustains a second concussion while still recovering from a previous one,” Dr. Bautista says. “This can be a career-altering versus career-ending complication seen in concussion recovery, and can even be fatal in some cases.”

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Time is essential

Each concussion is unique, but most require rest and medical attention, Dr. Bautista adds. That could take up to several weeks, he says.

NFL concussion protocol does not provide a timeframe for recovery, but players must go through five steps to return to play. The Dolphins recorded Tagovailoa’s first injury, in a game against the Buffalo Bills, as a back injury.

One of the more concerning symptoms the player exhibited on the field this week, however, gave experts pause.

“In the video, you see he’s shaking his hands, which is a key sign that something is very wrong. That kind of movement can be a sign that something is disrupting communication between the brain and the spinal cord,” Dr. Bautista says.

Other common symptoms of concussions include:

  • Nausea
  • Headaches
  • Balance issues
  • Sensitivity to light or sound

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Concussion myths

People often shake off fears that a blow to the head is a concussion and don’t seek medical attention. Dr. Bautista shares the following misconceptions:

  • Concussions require head trauma. While a severe blow to the head can cause a concussion, a person can have a concussion by sudden accelerated or decelerated change of movement like a whiplash motion.
  • Concussions cause loss of consciousness.
  • Concussions need to be diagnosed by CT scan. No imaging study or bloodwork can diagnose a concussion. They are diagnosed clinically. CT scan may be used to rule out something more serious like intracranial bleeding.
  • Concussions cause you to lose memory.

> Related: Why Brett Favre Estimates He Had 1,000 Concussions During His Career

The road to recovery

Rest, again, is the most important way to heal from a concussion. You can incorporate light activity like walking if you’re physically able to.

“The amount of light activity you can do may vary, although you shouldn’t have you to fight significant symptoms,” Dr. Bautista notes. “If simply walking causes considerable dizziness or headaches, you need to scale back.”

Failure to properly follow a recovery program can cause symptoms to persist for months or even years.

> Related: From Hopeless to Happiness: A Concussion Patient’s Journey