"Cancer today is a problem that is resolved when detected in time, and that is very important. If people take preventive measures, there's every chance of having it detected and treated, as happened to me," Rousseff said in television interview on the Globo television program "Fantastico."
Rousseff's health has been in the news since 2009, when she was diagnosed with lymphoma, from which she has recovered.
"My health is very good and I'm trying to lose some 4 or 5 kilos (9-11 pounds), to get back in the shape I was in before the election," the president, who has routine cancer checkups "every six months," said.
She acknowledged that since she won the presidential election last October she has been using more dresses and skirts, to affirm her femininity," and has gradually stopped using the pantsuits that were always a kind of trademark in her public life.
Brazil's first female president said that at 64 she did not put aside her vanity when she took office and always does her own makeup.
Rousseff's mother and aunt live with her at the presidential residence, which is staffed by 143 domestics, some of whom attend the frequent visits of the president's daughter and grandson.
During an informal interview, sometimes walking though the Alvorada Palace or standing in her office at Planalto Palace, the seat of government, Rousseff also mentioned the cabinet crisis she faced in the first months of her administration.
Since taking office on Jan. 1, the president has had to deal with the departure of chief of staff Antonio Palocci and the ministers of Transport, Alfredo Nascimento; Agriculture, Wagner Rossi; and Defense, Nelson Jobim.
All but Jobim stepped down amid charges of corruption.
"I hope I never again have to change a minister. They have not yet been tried and we can't condemn them," Rousseff said, adding, however, that "you don't get rid of corruption all at once, but we can make it more and more difficult. But you can't demonize politics in general."
Asked about the challenge it signifies for Brazil being the host of the 2014 soccer World Cup, the president expressed her confidence that the infrastructure works will be completed in plenty of time.
"I'm entirely sure of that, because we're going to have at least nine stadiums ready by the end of 2012," she said.