I have this low fever (up to 37.4, fluctuate during the day) for about a month. It started five weeks ago. Suddently I felt sick( chills, fatigue, loss of appetite) and measured the temparature about 37.4 (I use the old glass (mercury) armpit thermometer). I was very concerned at that moment since I was just back from China two weeks ago. I went to see the Doctor. However, Doctor said it probably just some virus-caused infection(cold, flu).No medicine was prescribed. However, I didn't have other important symptoms (soar throat, sneeze, running nose, etc.) amd almost didn't cough. Over the Easter weekend, I felt a little bit better although the low fever was still hanging there. I went out to visit some friends for couple of days. The second day(Tuesday) I was back to work, I felt sick again. This time more symptoms besides the low fever-muscle ache, fatigue, some ear pain, some headache, no appatite for food, chills, some cough; Especially, I felt some soar/pain at my upper right chest (the right corner area from above the breast to armpit). My blood test seems fine and I am waiting for the result of my chest X-Ray, although the doctor could not hear any thing from lungs. I am now taking antibiotics. Those ear pain, headache, seems improved however the fever is still there. I am really concerned since I never had such illness before. Could anyone give me some advice. Thanks.