Heard went on to say that Maggie was experiencing flu-like symptoms and called the trip to the hospital "precautionary."
Daley's doctor found she was dehydrated and told reporters her sickness could be related to the drugs she's taking in her most recent battle with bone cancer- or it could have been something she ate.
Maggie Daley, 66, was diagnosed with metastatic breast cancer in June 2002. Last month, she was diagnosed with a malignant tumor in her right leg. She is still undergoing treatment for that.
Last month the mayor got emotional as he talked about his wife's courageous battle with cancer.
"Maggie is very kind and tough person. She comes from a strong family. Her mother died when she was younger and she survived in helping her family and helped our family as well," said Daley.