Frontwoman Hayley Williams, of Paramore fame, has opened up about cancelling Monumentour dates alongside Fall Out Boy on August 4 and 5 in Texas, and revealed to her followers that she is suffering from 'exhaustion'. 

She posted an open letter to fans last night, in which she explained why the band had to axe the dates and confessed that she was really sad to not be able to play:

"Writing from my bunk to let you know that my doctor and my vocal coach have told me I can't play tonight either. I have a chest infection and ... Something called "exhaustion". Words in this tiny little message cannot begin to express my frustration, sadness, and overall loopiness (the latter is likely just from the cortisone and antibiotics...ugh.)"

Williams added: "I absolutely hate cancelling anything. Admitting defeat is a tough thing for this gal." She went onto confirm that the rest of the dates are due to go ahead as planned and said: "Doctor thinks I'll be good to go in the next day and certainly before the next show."

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Watch a recent interview with Williams here: