R&B singer Bruno Mars is asking fans for their cures after doctors diagnosed him with a sinus infection.

The "Grenade" hitmaker began feeling sick on Tuesday night and feared he was coming down with a severe cold - but his symptoms got worse and he was forced to visit the doctor.

In a series of posts on his Twitter.com blog, the desperate star has been asking fans for their help and advice: "How am I supposed to sing today with all this Mucus!?!?! HELP!

"Its (sic) an official Sinus infection guys. what am I gonna do??"

Mars is not currently on the road, so there's no risk of him canceling announced concerts. He's scheduled to start a European tour in London next month.