Danny Ainge is so frighteningly matter-of-fact when discussing his heart attack — his SECOND heart attack — that it makes you wonder whether his physicians failed to diagnose a head injury.

He laughs.

“Yeah, I mean, like, I don’t like talking about it,” Ainge says. “Everybody has their problems. Everybody has issues and challenges, and I had a rough week.”

He laughs again.

“You just move on,” says the Celtics’ president of basketball operations, digging in to the re-working of the Celtics’ roster just days away from the official beginning of the NBA’s free agent negotiating period — a stressful time when such isn’t exactly on the preferred menu for someone of his recent experience.

“I just had some chest pains and went to the hospital and, you know, had a heart attack and had a stent put in,” Ainge goes on, describing the April 30 event in Milwaukee with all the gravity of a trip to Market Basket. “It’s just… it’s just a wake-up call.”

True, his incident was described as a “minor” heart attack, but it was his heart and it came 10 years after his first such episode. And minor surgery is what they do to other people, right?

Perhaps he is truly fine as he proudly announces he’s lost 15 pounds (“maybe 17”) with a largely plant-based diet and shows his usual energy and wisecracking ability. Perhaps he’s heard Kevin McHale talk about Hibbing homie Bob Dylan so much that he’s come to know for himself that “negativity don’t pull you through.”

Even when Ainge takes serious for a brief walk, he washes it down with cheerful chaser.

“I’m at the stage in my life where I’m attending way too many funerals,” Ainge says.

He pauses for a split second and adds, “So I’m just happy to be here and excited for our upcoming season. I love my job. I love the people I work with. I love the players. They keep me young. They’re a lot of fun to be around, as you can see by the four guys we just drafted.”

Back on the afternoon of April 30, Ainge was preparing to watch his Celtics seek to open the playoffs with a sixth straight victory. There had been the 4-0 sweep of Indiana in the first round and the 112-90 manhandling of Milwaukee in the conference semifinal opener. The team he had assembled looked to be getting its shot together in time to make the postseason run everyone had expected before its dressing room became a superfund site during the 82-game warmup.

But before Ainge could make it to the Bucks’ arena, where the concession fare of bratwurst, beer and fried delights almost beg for a walk-in angioplasty clinic, he was visited again by a myocardial infarction.

Was he scared?

“No,” Ainge says. “Not really.”

Huh?

“I don’t know,” he says. “Maybe I’m just naive and not understanding the depth of it, but, I mean, I’m scared enough to the point where I want to eat better and I want to be healthier, and I’m listening to my doctors a little more diligently and taking better care of myself.

“So, yeah, I wouldn’t say that I was unhealthy, but I would say that I didn’t do what I needed to be doing, and I should have shown from having an episode 10 years ago. So, you know, you get really motivated for six months and then you sort of feel great again. I feel great now. I feel as healthy as I’ve felt.

“I ate better after the first time, but, again, you can always do better. Even before my first one, I wouldn’t say that I was a really unhealthy eater, it just wasn’t a focus of my health and my attention. So now there’s just more of a focus.”

As cardiologists like to put it, as long as you don’t get the big one, the second heart attack is, as Ainge said earlier, the wake-up call. The third one is generally accompanied by violin music.

“You’re under the fairway,” Ainge interjects, laughing again as he sneaks in a golf reference.

Part of the reason he’s able to keep his sense of humor is the support he’s getting from wife Michelle. He’s also got his son Austin on the Celtic staff to snitch on him to mom if he breaks his diet.

“It’s not that hard really to take better care of myself, to try to prevent a third one,” Ainge says. “I have an amazing wife who makes it easy for me to eat healthy, because that’s how she eats. She’s always been a really healthy eater. I have chefs here at the practice facility. I mean, I have no excuses.”

She’s got him eating “mostly fruits and vegetables,” and it’s clear she’d step in if the job or anything else were threatening his health.

“I think that this one was much more of an issue than the first one, you know, where she wonders about that,” Ainge says. “It’s because we’re 10 years older, and we know we don’t want to do this for the rest of our lives.”

He insists he didn’t have to ponder and make a decision on whether to stay in his job now.

“No,” Ainge says, “I had to make a decision to eat better. But I’m fine. I feel great.”

He also deflects any thought that he’s having a hard time with stress, even after what couldn’t have been a pleasant season with so many foolish fires to douse.

“You wonder how much of it is work and stress and those things,” Ainge says of his health issues, “but, you know, everybody has to manage challenges, health challenges and stress challenges.

“I would say that there are stressful days, but the job overall is not high stress, in my opinion. There are stressful moments. Like, I don’t get so stressed when we have a bad game. I mean, coaching is much harder. I’ve done that job. But my job is more to keep people in a good frame of mind, keep people positive through the adversity of a season. And just my nature, I’m more positive and see the bright side in things, and I think that eliminates a lot of stress.

“When you have humility and a gratitude for your job, realizing it’s an opportunity that anybody else could do and many could even do better, then it’s easier to deal with what comes. I’m just grateful for the opportunity that I have, and I don’t really see it as stress. I see it as a really fun, great job that has provided me a great life and a lot of joy and fun.”

Ah, but while he seems to have reached an easy peace with his heart situation, there is a health matter that disturbs Ainge.

“I have this thumb injury that’s completely unrelated to my heart issues, and that’s what’s bothering me right now,” he says, holding out his right thumb and staring at it with sincere anger.

He tripped over Aron Baynes on the practice court during the season. “I fell over a foot and just reached down to grab myself and dislocated my thumb,” he says. “I have to get the same surgery Romeo (Langford) had, the same surgery Marcus Smart had. I was just messing around.

“But now it’s messing with my golf game.”

If there’s anything in Danny Ainge’s life that has him stressed out, it is this. Everything else is just plant-based details.