Rihanna has canceled four shows, so far, on her Diamonds World Tour. Those tours are punishing, and it's not hard to believe the travel and stress could lead to illness.

But it's not clear what's wrong with Rihanna — or how she'll be getting better — and that's led people to speculate. TMZ was told in early March that Rihanna was suffering from a throat infection, so it's possible she still has lingering issues from that, more than a month later. On Tuesday, she was seen coming out of a medical building in Beverly Hills, and she said she's doing a lot better.

One rumor making the rounds is that she's pregnant. TMZ passed along the rumor, from "a slew of tabloid stories," but at least one outlet is shooting the idea down: "Gossip Cop can exclusively confirm that Rihanna is NOT pregnant. A source close to Rihanna tells Gossip Cop she is absolutely not expecting a baby."

So that's out, although Rihanna, 25, has said she will have a child, at some point. Just not this year, on the road! Her Diamonds tour started on March 8 and it's supposed to continue until October. We hope she has a swift recovery from whatever is ailing her.

Sources: TMZ, Gossip Cop