Nurse!

Ex-"American Gladiators" star Nitro was hospitalized for a HEART ATTACK on Wednesday, TMZ has learned ... and Nitro tells us he thinks STEROIDS played a factor.

Dan Clark says he experienced intense chest pains while working out at an L.A. gym that night ... and then his left arm went numb.

Nitro asked a buddy to drive him to a nearby urgent care center ... where they quickly realized he was having a heart attack and put him in an ambulance for a nearby hospital.

Once Nitro arrived to the hospital, he was rushed into emergency surgery to remove a blood clot in one of his arteries. During the procedure, doctors fitted Nitro with a brand new stent.

Nitro says the whole thing was a shock 'cause he's in peak physical condition ... and believes the heart attack may have been a result of the YEARS of steroid abuse from his days as a Gladiator.

According to Nitro, 'roids weren't viewed as taboo back in the AG heyday ... it was just part of the culture.

Clark says he's confident he'll make a full recovery and says the worst part about the whole ordeal ... he can't workout for a month.

#GymRat

Barron Hilton is still going through the healing process -- after some guy smashed his face in during a coke-fueled party in Miami earlier this month -- showing off his scabby battle wounds Thursday in Hawaii.

Barron surfaced in Maui with his GF -- 4,600 miles from the crime scene -- wearing sunglasses ... and some baby scars above his nose and his eyes. A little Neosporin would go a long way.

As we reported, Barron got his ass handed to him by one of Lindsay Lohan's friends during a mansion party in Miami. Barron blamed Lindsay for orchestrating the attack, but the guy who punched him says Lindsay's innocent ... he punched Barron all on his own.

The star of VH1's "Real Chance of Love" went under the knife Wednesday night to remove huge chunks of cancer from his colon ... and TMZ has learned the operation was a guarded success.

A rep for Ahmad Givens a.k.a. Real tells us ... when doctors began operating Wednesday night they thought he had colon cancer. Turns out it was stage 4 rectal cancer and they were able to remove it all.

But there was another problem. Real also had 7 tumors in his liver. Doctors removed all but a small portion that was deep in the liver. The docs are hopeful ... with radiation they can eliminate the remnants of his liver cancer.

Bottom line .... going into the surgery, it looked like Real was a goner, but now he has a good, fighting chance of survival.

"Real Housewives of Atlanta" star NeNe Leakes says she's not out of the woods yet ... after doctors found blood clots in her lung.

NeNe was hospitalized last month. after suffering shortness of breath ... and that's when doctors found the clots.

NeNe was looking good at LaGuardia Airport in NYC and she gave us the low down on what could have been a fatal problem.

Ambulances raced to Justin Bieber's Calabasas home early this morning after they received a 911 call saying a woman passed out inside ... TMZ has learned.

We've learned paramedics were dispatched to Bieber's crib this morning around 3 a.m. after someone at Bieber's reported there was a 20-year old unconscious female at the house ... but 15 minutes later the ambulances were called off.

Bieber was home at the time 911 was called. The person who called off the fire department told dispatch the woman would be transported privately to the hospital. But sources familiar with the situation tell us ... the woman regained consciousness and when she was told 911 had been called she insisted they be called off.

We're told the woman did not go to the hospital. She went home instead. We know alcohol was involved. We don't know what, if anything else, was involved.

We're also told the woman was attending a party thrown by Bieber.

Bruce Jenner called his Beverly Hills plastic surgeon Friday and cancelled his scheduled surgery to flatten his Adam's Apple ... TMZ has learned.

Sources connected with Jenner say he was upset information about the procedure leaked out and blamed people in the doctor's office. We're told Bruce informed them he was taking his business elsewhere.

TMZ broke the story ... Jenner had 2 consultations with the doctor and had scheduled surgery for both a Laryngeal Shave (Adam's Apple flattening) and a nose job. We're now told the surgery was scheduled for next Wednesday. Sources say Jenner wanted a smaller nose. Bruce tells TMZ he wanted plastic surgery because of scar tissue after cancer removal surgery.

Multiple medical sources have told TMZ ... getting a Laryngeal Shave is almost always the first step in gender reassignment. Bruce scoffs at that, telling TMZ, "I just didn't like my trachea."

Mark Wahlberg is still feeling the pain after putting his neck on the line while filming "Transformers: Age of Extinction" back in October -- stepping out in Hollywood Wednesday with a neck brace.

Wahlberg didn't hurt his neck while performing some awesome stunt. The actor claims he woke up one morning while filming in Hong Kong ... and his neck just started hurting ... he doesn't know exactly why.

We're told Wahlberg's docs think the brace will help his recovery.

Keep your head up.

Good news dog lovers -- Amanda Bynes' canine (the one she accidentally soaked in gasoline back in July while setting a neighbor's driveway on fire) has been placed in a new home ... far, far away from Amanda and flammables.

Sources close to the Bynes family tell us, Sherbert was taken away from Amanda after she was placed on a 5150 psychiatric hold in the summer.

While she was in rehab, we're told Amanda's parents cared for Sherbert ... but have since given him away to a family friend because Sherbert didn't get along with the Bynes family's other dogs.

Sad for Amanda ... as we reported, the actress desperately loved the dog and begged to see Sherbert while she was getting inpatient treatment for schizophrenia and bipolar disorder.

Safe to say, lil Sherb survived some dark days -- here's that video of Amanda rushing to a nearby liquor store to clean him after the near-charring.

Sharon Osbourne is taking full responsibility for misleading her fans about the tightness of her hoo-ha ... admitting she MADE UP the story about getting vaginal rejuvenation.

Osbourne appeared on "Howard Stern" on Sirius/XM this morning and exposed herself -- saying she was simply messing with Graham Norton when she recently told the BBC talk show host she had a surgical procedure to tighten up her lady junk.

"I made it up just to be flippant," Sharon said ... adding, "How could I do that after I've had so much ill health? Now I'm not gonna start putting scaffolding up my vagina?"

Kevin Dillon tells TMZ ... the "Entourage" movie will finally begin shooting in January -- and he won't let a little thing like a BROKEN WRIST keep him from doing his job

Dillon -- who was doing some shopping in Malibu last week -- wouldn't say HOW he jacked up his wrist, but explained that it's not the first time he's suffered the injury.

There was one more thing ... we asked Kev about his truck, the one that embarrassingly broke down on him (in front of our camera) the last time we shot him out ... and he dropped an interesting fact about an unlikely HERO who saved the day. Check out the clip.

Susan Boyle has announced she was diagnosed with Asperger syndrome sometime last year ... but says the whole thing has been one big blessing in disguise.

The "Britain's Got Talent" star made the announcement Sunday with the UK Guardian ... telling them her diagnosis was a relief -- because people will finally get a "greater understanding" of who she is.

Susan says she struggles with relationship and communicative difficulties -- but getting a grasp on her Asperger's will help her deal with those sitations better.

For those unaware -- Asperger's is a mild form of autism.

Susan adds, "Now I have a clearer understanding of what's wrong and I feel relieved and a bit more relaxed about myself."

Paris Hilton has a message for Lindsay Lohan -- and the guy who allegedly put Paris' younger brother in the hospital this week after beating him down -- WATCH YOUR BACK!!!!

Barron Hilton posted a photo of his jacked up face on Instagram Saturday -- showing the aftermath of his brawl with a guy he claims punched the crap out of him at LiLo's request ... and it fired Paris up.

Paris commented on the pic saying, "They both will pay for what they did. No one f***s with my family and gets away with it!!"

And she even added TWO hot-head emoticons to show she means business.

For what it's worth -- Lindsay and her dad deny she had anything to do with the incident ... even though there's video telling a different story.

Barron Hilton's injuries from a beat down -- which he claims Lindsay Lohan masterminded -- have gotten serious enough that he's seeking emergency treatment in Miami ... TMZ has learned.

Paris Hilton's bro is staying at the Fontainebleau Hotel ... where an ambulance arrived last night to take him to the hospital.

TMZ broke the story ... Barron was partying at a Miami mansion early Friday morning when he says Lindsay accused him of talking trash, and then had a male friend beat the crap out of him.

Barron was left bloodied with several cuts to his face -- and sources close to the Hiltons tell us the injuries are so bad ... he was advised to seek medical treatment immediately.

We're told Barron turned down the ambulance at his hotel, and instead got private transport to the University of Miami Hospital ... where he received various treatments -- including a CT scan.

Lindsay and her father, Michael Lohan, deny she was involved in the incident at all ... though video outside the party suggests otherwise.

Cocaine and booze were in abundance at Lindsay Lohan's party where Barron Hilton was beaten to a pulp ... multiple sources tell TMZ.

Our sources say a number of people at the party were snorting and drinking non-stop. Sources connected with Lindsay insist she was NOT partaking and even threw some of the druggies out of the party.

Now check this out ... the video showing Barron confronting Lindsay was shot around 11AM EST Friday ... the party having started the night before.

A female survival expert who appeared on "Naked & Afraid" is currently recovering from DENGUE FEVER -- and nearly died -- after contracting the virus in a Panama jungle, TMZ has learned.

45-year-old Manu Toigo was bit by a mosquito back in September, while filming her episode (which airs this weekend on the Discovery Channel).

At first, Manu says she didn't think twice about the bug bite ... until she arrived back in L.A. days later and began to experience a severe headache between the eyes. The headache progressed to a fever, then nosebleeds and gum bleeding, then she couldn't even stand up.

Doctors initially told Manu she was anemic, but things only got worse -- and she was forced to go back to the hospital, where they finally diagnosed her with dengue hemorrhagic fever ... the worst form of dengue fever.

FYI, Dengue fever becomes "hemorrhagic" when the virus damages blood vessels to the point they hemmorhage internally. And the worst part -- there's no cure.

Manu says she got to the hospital just in time, and doctors kept a close eye on her -- pumping her with fluids and plasma -- so she was able to make a decent recovery. Manu spent a total of 2 weeks in the hospital and is now in physical therapy, trying to get back on her feet. She says she's still in agonizing pain all over her body.

(New information bolded)

Paris Hilton's little brother Barron Hilton was jumped this morning -- and beaten to a pulp -- and he claims Lindsay Lohan masterminded the attack, TMZ has learned.

We know Lindsay's denying she ordered the hit -- in fact, she claims she wasn't even on the scene at the time of the incident -- but now we have video (above) that proves otherwise. It shows Barron (blonde hair, white shirt) and his friends confronting LiLo right after the attack.

Multiple sources connected to the situation tell us ... Barron attended a party last night at a Miami mansion where Lindsay has been staying while she's in town for an art festival -- a party that lasted until well after the sun came up.

We're told ... during the party, someone accused Barron of talking smack about Lindsay -- and a short time later he was attacked and beaten to a pulp. TMZ obtained a photo of the damage.

We know ... 24-year-old Barron spoke with police following the incident. He claims Lohan orchestrated the beating.

Barron told cops Lindsay approached him at the party with a male friend and began screaming, "'You talk sh*t about me to my boyfriend, this is what you get."

As the guy proceeded to pummel Barron, Hilton claims Lindsay was laughing and egging him on.

Cops were called to the scene and interviewed Barron. We're told Barron doesn't know the identity of his attacker but is adamant Lindsay is the person behind the attack.

We spoke to Michael Lohan who insists Lindsay had nothing to do with the attack and had left the mansion BEFORE the fight went down.

Michael claims there are several witnesses -- including security guards -- who will back up Lindsay's alibi.

Michael says Lindsay was adamant she didn't want to be around any trouble ... i.e. drugs, alcohol, violence ... and even had people removed from the house before the fight ever went down.

Problem with that alibi is -- the video of Barron nearly face-to-face with Lilo outside the mansion ... just moments after the fight.

Lindsay's had bad blood with the Hiltons for years -- stemming back to when Paris' friend Brandon Davis went on the infamous "firecrotch" rant back in 2006.