I fee really sorry for your brother's condition.
Yes indeed, his cirrhosis likely worsened causing ascites and swollen belly.
The soreness and swelling of the arm can be due to the bacterial infection also known as cellulitis.
This is common with cirrhosis --the bacterial infection.
Another possibility can be a blood clot in the upper vein causing the pain and swelling.
THis should not be neglected in either case.
Better to address in the ER with a doppler ultrasound.
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