|Photo Credit - democracychronicles.com|
Police detained Cao Shunli in September at Beijing's international airport before she was to fly to Switzerland to take part in a UN review of China's human rights.
A lawyer representing the activist says an early denial by police of medical care prompted an internal infection to worsen.
"Although the infection has been reduced, she is still in danger," Mr Wang said, citing information from Ms Cao's brother.
"I am still very worried about her." Her lawyer says she remains in serious danger.
Ms Cao was said by rights groups to be one of a group of activists who held a sit-in protest outside China's foreign ministry in June to demand greater participation in the UN's review of China.
Amnesty International says she's a "prisoner of conscience" and that she should be released "immediately and unconditionally".
Beijing police were not immediately available for comment on Ms Cao's case.
China won a seat on the UN Human Rights Council in November along with Russia, Saudi Arabia and Cuba, despite fierce international criticism of their records.European countries and the US regularly condemn China on human rights, citing cases including its jailing of dissidents and treatment of ethnic minorities.