I have found that getting rid of a cold seems to be much harder and take far longer than it used to. I did get flu last year ('09-'10 season) that refused to budge for approximately 6 weeks as opposed to the usual 3 weeks it used to take and I lost my voice almost completely for that entire time! The chest infection I contracted as a complication to this in turn caused asthma which was diagnosed in May last year. Obviously, being a diagnosed asthmatic now has resulted in my being eligible for the flu jab which I had just before Christmas. However, I had another cold which took 6 weeks to run its course with complications resulting in brochitis before that and I caught another one from one of my guests on Christmas Day, which is still present now. It seems as though the cold is running its course in slow motion; I have been coughing since Christmas and now the stuffy runny nose has finally made its entrance this morning, so I guess this will take another 3 weeks to clear up. Oh whoopee! Could the hypo thyroid be responsible for this?