The 47-year-old from Downey, Calif., said that he also started struggling with heartburn and constipation and noticed that, at times, he had a hard time catching his breath.

At 300 pounds, he said, strangers had started to stare, and friends were cracking jokes about his “beer belly,” even though he said he rarely drank the beverage.

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When he first mentioned the issue to a physician, he said, the doctor brushed him off, telling him some people just carry weight differently than others.

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“I just thought I was fat,” Hernandez said in a phone interview on Tuesday with The Washington Post.

But Hernandez said his stomach kept feeling “heavy” and “hard” to the touch, so he got a second opinion.

Ultimately, he said, he was diagnosed with a retroperitoneal liposarcoma, a rare but cancerous tumor that forms in fat cells, according to the Mayo Clinic.

Doctors don’t know when the tumor started growing.

Or why.

But it weighed 77 pounds, according to his surgeon.

Hernandez said he did not know how to feel about the tumor or the surgery needed to remove it.

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At first, he said, he was “shocked” and “confused” but also relieved that he finally knew what was wrong.

“I had a lot of support and prayers from family and friends,” he said, noting they are raising funds to help with his recovery. “I finally left it in God’s hands.”

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Hernandez’s surgeon, William Tseng, a surgical oncologist and assistant professor at the Keck School of Medicine at the University of Southern California, said liposarcomas develop over years and can grow to a massive size, though they do not tend to spread or cause major problems. Tseng, who specializes in sarcomas, said that throughout his career, he has surgically removed dozens of them, which typically are between 20 and 30 pounds.

“This is probably the largest one I’ve removed,” he told The Post, speaking about Hernandez’s tumor.

During an hours-long surgery over the summer, Tseng removed the massive tumor, which he said had spared Hernandez’s major blood vessels and most organs, though he had to cut out a kidney that had suffered damage. Tseng said that bleeding is the biggest risk associated with the surgery and that patients can die on the operating table but that there were no complications in Hernandez’s case.

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The surgeon said Hernandez will not need to undergo chemotherapy or radiation but that, because liposarcomas often return, Hernandez must have periodic follow-up scans to monitor the situation.

“I was really lucky,” Hernandez said.

Now, Hernandez said he feels “totally different” — more energetic and many, many pounds lighter. Though, he said, he is “still not 100 percent.”