Zimbabwe's main opposition party leader Morgan Tsvangirai pauses as he addresses supporters at a rally in Harare. Picture: Tsvangirayi Mukwazhi/AP

Harare - Zimbabwe opposition leader Morgan Tsvangirai suffering severe vomiting after a party meeting and was airlifted from Harare to a Johannesburg hospital on Friday, a senior party source said on Saturday.

Tsvangirai's condition was currently stable, the source said, adding that the sudden illness did not relate to Tsvangirai's ongoing cancer treatment.

Last month Tsvangirai signed a coalition deal with other smaller parties in a bid to oust long running President Robert Mugabe in presidential elections set for next year.