The premiership player was concussed against Melbourne last Sunday, on return from another concussion against St Kilda on March 28.
"Definitely, there's obviously concern there," Brisbane captain Harris Andrews told reporters on Tuesday.
"He's a good friend of mine and you never like seeing guys get concussions, but obviously to get a couple in a short period of time is concerning.
"He is one of the all-time great teammates, super-tough ... from a club perspective, it's just all about his health and his wellbeing."
The 26-year-old Answerth, who played in the Lions' 2024 grand final triumph, will miss at least Saturday's home clash against Adelaide.
"He plays the game in way that is probably not great for his body, but that's part of the reason why we love him so much and why he's such a great teammate," Andrews said.
"Unfortunately, he's going through a bit of a tough run particularly over the last 12 to 18 months.
"But he will keep fighting through. He's one of the more resilient guys we have at the footy club."
Andrews said concussions had been a serious issue since his arrival at Brisbane in 2015.
In 2016, the Lions' Justin Clarke retired due to ongoing concussion issues.
Two years later, ex-Collingwood defender Jack Frost did likewise after playing two games for Brisbane in 2017.
And the Lions' Marcus Adams announced his retirement before the 2023 finals series, following doctor's advice to avoid contact sports in the wake of several concussions.
"It has obviously been disappointing to lose a few of those guys along the way, you think back to Marcus Adams, Jack Frost, Justin Clarke even in the first couple of years I was here," Andrews said.
"Concussion is a real issue. As a club we do a great job supporting those guys that have gone through it and I can attest for that in situations that I have faced.
"Ultimately, what we have built our football club on is just that care for the players and staff and everyone within the joint."
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