It seems that all the loads go straight to his stomach.
Hector Hernandez said he was always a "big man", so he didn't see the problem until a few years ago, when his arms and legs began to shrink, while his stomach grew bigger.
The 47-year-old man from Downey, California, said that he also began to struggle with heartburn and constipation and realized that, sometimes, he had difficulty breathing.
With a weight of 136 kilograms, he said, strangers began to glare, and his friends told jokes about "his blue stomach", although he said he rarely drank it.
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When he first mentioned the problem to a doctor, he said, the doctor brushed it off, telling him that some people only carried loads that were different from the others.
"I just think I'm fat," Hernandez said in a telephone interview with The Washington Post.
But Hernandez said his stomach continued to feel "heavy" and "difficult" to touch, so he got a second opinion.
In the end, he said, he was diagnosed with retroperitoneal liposarcoma, a rare tumor but cancer that forms in fat cells, according to the Mayo Clinic.
Doctors don't know when tumors begin to grow. Or why.
But it weighs 35kg, according to the surgeon.
Hernandez said he did not know how to feel about the tumor or the surgery needed to remove it.
At first, he said, he was "shocked" and "confused" but also relieved that he finally knew what was wrong.
"I got a lot of support and prayers from my family and friends," he said, saying they were raising funds to help with his recovery. "I finally left it in God's hands."
Hernandez surgeon, William Tseng, an oncologist and assistant professor at the Keck School of Medicine at the University of Southern California, said liposarcomas developed over the years and could grow into large sizes, even though they did not tend to spread or cause major problems.
Tseng, who specializes in sarcomas, said that throughout his career, he had carried out surgical operations on dozens of them, which usually averaged between nine and 14kg.
"This is probably the biggest I deleted," he said The post.
During a one-hour operation during the summer, Tseng lifted the tumor, which he said had saved the main blood vessels and most of Hernandez's organs, although he had to cut the damaged kidney.
Tseng said that bleeding was the biggest risk associated with surgery and the patient could die on the operating table, but there were no complications in the case of Hernandez.
The surgeon said Hernandez did not need to undergo chemotherapy or radiation, but because liposarcoma often returned, Hernandez had to follow up regularly to monitor the situation.
"I'm really lucky," Hernandez said.
Now, Hernandez says he feels "totally different" – more energetic and much, much lighter.