Hi doctor, I am 33 years old, tall and slim. By look I am healthy, but for more than 12 years (as I could remember), I get affected by throat pain followed by cold and then fever which lasts for 4-8 days. And this repeats once in 2-3 months, rarely once in 6 months or once in a month also. I have consulted many doctors, its found I have sinus problem and nothing found beyond that. Please advice, based on your experience what might be the reason for this fever attack frequently, and what next steps to be taken by me.