The 79-year-old appeared alongside his medical team at a news conference at Sírio-Libanês hospital in São Paulo.
"This here is not an interview, this is simply a session to say thanks. To thank, firstly, God, who has looked after me in a very generous manner," he said.
Lula was taken to hospital on Monday after he had complained of a severe headache.
Doctors performed a craniotomy on the president, a procedure in which part of the bone is surgically removed from the skull to treat the bleed and relieve the pressure. The bone is then replaced.
Brazil's President Luiz Inácio Lula da Silva has been discharged from hospital after undergoing emergency surgery for a brain bleed, doctors said.
https://www.bbc.co.uk/news/articles/c4gxd7qglz6o