My mom just did her first treatment of chemo two weeks ago, and today she develped a fever of 100.5. She took motrin it helped to keep the fever down at 98.5 and then at bed time it came back up at 100.5. What does this mean? I know the nurse warned us that a fever may develope, but why and from what? Is it a sign that her immune is down? Any expirience, suggestions and advice is great. Thanks