It can't. Massage has never been shown to help or cure any disease. Some people find it relaxing, and that's about it.
Isn't it strange that people who claim massage can cure disease can't actually back it up with any solid evidence? I can claim that snorting dirt cures Myasthenia Gravis all day long, but my worthless claim alone doesn't make it fact.
Where's the proof? It is too bad the other person answering cannot provide examples of specific research or growing body of evidence for massage.