Originally Posted by WildVolley
As I've stated previously, neither of us can be sure. However, it is wrong to think that everyone suffers as much from the same flu virus. People with weak or compromised immune systems can die from a seasonal flu. The rest of us suffer a lot, a little, or not at all.
You've had the flu and not suffered at all (had no symptoms)? I'll have to take your word on that. Or do you mean that you had the flu virus, but since you had the flu shot, your body was able to rid it from your body before you got sick with symptoms?
Generally speaking, flu's are more severe than colds.
I also think you can just check for fever. You might get a very mild fever with a cold (but usually not, unless you are a kid), but will always (nearly always?) have a fever with the flu.
This CDC article basically agrees with us both. It says that it is impossible to tell the two apart, but suggests common symptoms associated with each.