Corgan fell ill just before a concert in Madrid on Wednesday (December 7), but was able to continue with his scheduled gig after receiving help from local medics.
"Spent the whole day puking from food poisoning. But the docs here in Madrid got me up and runnin. Gonna be a fascinating show (sic)," the rocker tweeted.
The current incarnation of The Smashing Pumpkins will wrap up their European tour with shows at Campo Pequeno in Lisbon, Portugal tonight and on Friday.
Corgan and his band are currently working on their ninth studio album Oceania, which is expected to be released in 2012.
Earlier this year, Corgan said that the original Smashing Pumpkins line-up will never reunite.
> Billy Corgan blasts Pavement on Twitter
> Corgan slams "irrelevant" Courtney Love
Watch The Smashing Pumpkins' 'Tonight Tonight' music video below: