Is a common cold or the flu likely to reduce affect immune system sufficiently to allow the recurrence of a head/neck cancer?
No. No prrof over time to show any relationship of htis.
No. Having a cold does not reduce the immune system. In fact, the whole problem with the common cold is that it is a disease in which the immune system over-enthusiastically attacks a mild virus, causing all of the miserable symptoms we know and love. If anything having a cold is a sign of a robust immune system and shouldn't have any implications with head or neck cancer.
Is It possible to be immune to the flu? Never had a flu shot in my life and I can't remember the last time I was sick other than a common cold..
Just lucky so far. There is no natural immunity to influenza. At least half of all people your age (20) have never had overt influenza, so this is nothing unusual. You have just been lucky so far; either you never caught it, or you had mild symptoms. Flu often is no worse than a common cold. You definitely still should always have recommended influenza immunization every year. Read more...