A Brazilian man with an upside-down head revealed his fear of catching up COVID-19, as he worried that it might kill him.

Claudio Vieira de Oliveira from Monte Santo suffers from a rare condition called arthrogryposis multiplex congenita. The illness affects his joints that also has left him with muscular atrophy in his legs, and his arms are stuck by his chest, The US Sun reported.

According to Daily Mail, the COVID-19 has brought Vieira de Oliveira's usually busy life to a pause, giving up many of the activities he loves to do.

Vieira de Oliveira said he has been isolating at home for over a year to remain safe from COVID-19. The Brazilian man said he hoped to get back on track in the next month. 

"I've never had difficulties, my life is normal. I'm in full-on quarantine because this COVID is very aggressive, it's lethal, so we're scared. I'm being over twice as careful," he told Brazilian news site GI. 

The Brazilian man noted that he only leaves the house for things that only he can do in person, like banking.  

Vieira de Oliveira, who already released a DVD and an autobiography, has spent over two decades working as a motivational speaker. 

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Claudio Vieira de Oliveira and COVID-19

Despite the physical condition, Claudio Vieira de Oliveira noted that he has never experienced difficulties in most of his entire life, and he deemed his life as normal, 7News reported.

Doctors believed that he would not survive past 24 hours, but he is now 44 years old. Also known as Claudinho, Vieira de Oliveira said he never let his condition be in his way since he was young. 

He started walking on his knees since he was seven years old, and his mom taught him how to read and write at home. The Brazilian man also said he has no difficulty in seeing, eating, drinking, and breathing.

The Brazilian Man and His Activities

Claudio Vieira de Oliveira, who volunteers with the Alegra-te Christian educational project for vulnerable children, told local media that he already missed being a motivational speaker.

"I'm missing it so much. I've got a speech in the municipality of Bezerra, in the state of Pernamubco," he said. "If the pandemic eases, he noted that they would go ahead. His talk is booked for April 28. The Brazilian man hoped he could do his talks again "and live for many years."

Arthrogryposis Multiplex Congenita

Also called AMC, the arthrogryposis multiplex congenita usually affects the joints of the legs and arms, according to the National Organization for Rare Disorders (NORD). 

The AMC's symptoms are present at birth. The condition targets the joints of an individual, making them permanent in a bent or straight position.

The condition completely or partially restricting one's movement of the affected joint. The cause of AMC is still unknown, but some cases reportedly occur as part of rare genetic disorders that are inherited. 

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WATCH: Management of Arthrogryposis - From Global HELP Organization