The 'Down For Whatever' singer was absent from the live shows on October 29 and October 30 after being diagnosed with a throat infection. She was replaced by former X Factor champion Alexandra Burke.
Speculation arose that Rowland exaggerated her illness following a feud with fellow judges Tulisa Contostavlos and Louis Walsh over comments made about her act Misha B the previous week.
"I was ill," Rowland insisted to the Daily Mail. "I didn't know what was wrong with me. I stopped eating and drinking, and got so dehydrated the doctor put me on a drip.
"I was so sick I had to postpone everything. It was such a slap in the face when people said I was faking."
In the same interview, Rowland argued that Contostavlos had been "completely out of line" with her criticism of Misha B.
Watch Kelly Rowland phone in sick on The X Factor below: