Susan has been in a non stop frenzy since she released her album late last year, more than 8 million units sold and Susan is still heavily promoting here debut album.

All this work takes it’s toll and Susan collapsed at Heathrow airpot earlier this week, she was in British Airway’s VIP lounge when her legs gave way and she fell to the floor, paramedics soon arrived at the sceen and treated her.

Later that day she gave a fantastic performance at the San Remo festival in Nice, Italy so this doesn’t seem to be a matter of concern.

The singer canceled concerts in Pittsburgh and Cleveland last week after suffering from swollen vocal cords.

However, Alicia recovered in time to return to action in Columbus at the weekend.

Alicia's spokesperson blamed the cold weather in New York for her problems, after the singer recorded a TV appearance in the city.

Theola Borden said: "It was really cold outside. That was a bit strenuous on her. Afterwards, she went to rehearsal in Pittsburgh but wasn't feeling up to par. She felt she needed to cancel rather than give a sub-par performance."

Alicia isn't the only person on the tour to suffer health problems.

Support act, and "American Idol" winner, Jordin Sparks is currently undergoing medical treatment and has been forced to rest her voice until next month.