Rare are the days there isn’t some pang or ache.

Ronda Rousey’s body is a 28-years-in-the-making game of Operation come to life.

From her cartilage-contorting cauliflower ears, once a source of embarrassment in high school — “it was more socially frustrating an injury than physically … it sucked, you know?” — down to her scarred feet and abused toes.

“I’ve broken all my toes pretty much, some of them several times,” the undefeated UFC women’s bantamweight champion and 2008 Olympic judo bronze medalist said.

• RONDA ROUSEY AND PAIN: Take an interactive tour of the champ’s many injuries

“It’s just like a judo thing. I’ve probably had more breaks in my toes than I have toes.”

Leave it to the UFC’s Queen of Pain, who has vanquished all 10 of her professional MMA foes — via eight armbars, one TKO and one knockout — to explain her relationship with physical agony in such an analytical nature.

“Pain is just information being delivered to my brain and it’s supposed to be useful,” said Rousey (10-0), who will defend her title against Cat Zingano (9-0) at UFC 184 on Feb. 28 at Staples Center.

“If something hurts, it’s for a reason because my body wants me to pay attention to it, and I decide whether it’s something I need to pay attention to or not.”

And then there are times attention is paid, but maybe mother and daughter are not on the same page.

After tens of thousands of miles of travel, years of tournaments and an endless number of judo throws, Rousey and AnnMaria DeMars offer conflicting accounts about an injury.

What’s not in dispute: Rousey, during her first and decisively last time ditching school, hurt her left foot jumping over a fence.

Rousey contends her mom, who in 1984 became the first American to win at the World Judo Championships, sent her to compete in a judo tournament in Northern California as a form of punishment.

“I was like, ‘I don’t have a social life. What are you gonna do?’” Rousey recalled. “She was like, ‘You’re gonna fight on it.’”

DeMars disagrees with the account.

“If I ever write my autobiography, it should be titled “I Was Out Of Town At The Time,’” she said after a laugh.

DeMars says she was in Texas and caught a tournament recap from her daughter, who had gone to the competition with the family of a fellow judoka. While Rousey did win the tournament, she suffered one somewhat surprising loss because, as she explained to her mom, she couldn’t push off her foot.

“And I said, ‘Wait … what’s wrong with your foot?’ And the whole story comes out because Ronda’s a terrible liar,” DeMars said.

A trip to the doctor revealed not only a broken second metatarsal, but other broken bones.

“He said, and I said, it can’t be that bad. She fought seven matches on it, right? And she won the tournament,” DeMars said. “He said, ‘I’ll X-ray just in case.’ He comes back in and you should have seen the look on his face.”

Chalk it up as another inexplicable encounter between Rousey and her constant companion.

Pain.

This is someone who fought her first pro MMA bout with nine stitches in her left foot — hidden from her opponent and fight officials — after getting bitten by a friend’s dog.

But it was her most recent victory — a first-round knockout of Alexis Davis at UFC 175 on July 5 — that stands out. Not only was it her first via strikes, but Rousey needed just 16 seconds to do it.

Arthritic spurs had been rubbing against her ACL for her two previous fights, and minor surgery on her right knee was planned for mid-July. After tearing the ACL in her right knee when she was 16, followed by arthroscopic procedures at 18 and 20, Rousey was long overdue for maintenance.

“Her knee was so bad she couldn’t squat down,” said Edmond Tarverdyan, Rousey’s trainer.

Nine seconds into her fight with Davis, it went like this: right hook to the temple, knee to the body, headlock and throw, nine straight punches to the downed Davis. Fight over. Second-fastest title victory in UFC history.

Yet it was the two other injuries from the Davis fight — all of four seconds apart — that were unexpected.

A ganglion cyst on the second knuckle of Rousey’s right fist that had been nagging her for several months. With the right hook that staggered Davis, the cyst exploded, causing a large gash under the glove and protective wrap.

Not only did Tarverdyan predict Rousey would get her first knockout, he knew she wouldn’t shy away from unleashing her damaged right hand.

“She loved that pain a little bit in the knuckle. She was like, ‘I’m gonna knock her her out with this knuckle. I love it. I’m gonna squeeze it so hard and break her head with it,’ “ Tarverdyan said. “And she absolutely did that.”

After the knee and throw, Rousey unleashed nine punches, the first one skimming the face of the dazed Davis and doing more damage to Rousey’s right hand.

“I broke my thumb right at the joint, by the wrist, which is good. It means I was really squeezing my hand hard when I hit it, so I was properly hitting,” said Rousey, who received nine stitches for the knuckle and later underwent thumb surgery and had a pin inserted.

“Well, I still missed her face, because I’ve never thrown on an unconscious person before. I didn’t anticipate that her head would bounce, so I missed and grazed my thumb.”

Which brings us back to her mom, who was already upset her daughter had rolled the dice and fought with a balky knee and irritated knuckle.

So when DeMars showed up at Rousey’s Venice home and found her daughter, with stitches in knee, knuckle and thumb, lying in bed and feeling sorry for herself, what was the answer?

“My mom made me get up out of my bed and start doing abs on my floor,” Rousey said. “She’s like, ‘The other stuff works. Figure out what you can do.’

There is no begrudging the advice or tough love. DeMars had once trained days after knee surgery and a week after giving birth to her first child.

When a judo teammate hurt an ankle and her parents retrieved a pillow to prop up her injured foot, a pre-teen Rousey sought similar treatment after breaking her big toe.

“She comes up to me limping, she says, ‘Where’s my pillow?’ “ DeMars said. “I said, ‘You’ve got nine more toes. Go run.’ Where’s my pillow? Yes, I’m a terrible mother, but … oh well.”

Rousey has inherited that similar grit from her mom. Call it a love-hurt relationship.

A common Rousey refrain comes from DeMars herself: You have to be good enough to be the best in the world on your worst day.

“AnnMaria did an amazing job with understanding Ronda’s personality to bring the best out of Ronda Rousey. She did the bring the best out of her for sure,” Tarverdyan said. “The focus, the heart, the spirit. The work ethic, the listening skills, the being the student.”

“Tolerating pain. It’s not only the pain, she can take the pressure.”

Rousey knows her road to greatness is strewn with not just bumps and bruises, but surgeries and scars.

And on her journey, she has embraced every one of them.

“I’ve become extremely thankful for every injury I ever had. Every single setback or injury has really been a blessing in disguise,” Rousey said. “I think of injury time as not time off, but time to utilize and focus on the things that I can and make them way, way better, and time to specialize is a good thing.

“So every injury has made me better. I’m thankful for all of them.”