Lionel Messi is being treated by a doctor in an effort to cure his vomiting problem.

Messi was in the north-eastern Italian town of Sacile on Thursday -- reported to be his third visit -- to seek help from Giuliano Poser to resolve an issue that has been present throughout his career.

"Lionel came here for other treatment too, but for professional reasons I cannot say what they were," Dr Poser, who also had Villarreal forward Luciano Vietto in his waiting room on Thursday, told La Gazzetta dello Sport.

"I've been working with sportsmen for 20 years, even from other sports such as cycling and downhill skiing. Messi came here thanks to word of mouth among footballers and agents."