I am a 49 yr old, relatively healthy, Asian female who started walking for exercise about 3 weeks ago. However, every day for the past week, right around the same time (about 130 or 230 pm) I start getting the chills. When I take my temperature, it is usually around 99.5 to 99.9. I don't have any aches or pains or infections that I know of. I have been taking Tylenol for the fever, but the next day this happens all over again. I have lost about 6 lbs since I started walking.