 [ Symptoms ] 15 year old son has had headache and fever last several days no cold symptoms and fever goes away after tylenol and laying down but then comes back fever yesterday was 101 and today 102 took tylenol 3 5 hours ago and went down to 100 2 after 12 hour it went up to 100 9 [ Disease ] rheumatic fever can lead to a condition known as rheumatic heart disease this is usually a thickening and stenosis of one or more of the heart valves and often requires surgery to repair or replace the involved valves