When I use to hear this from people that didn't understand my "predicament", I would go in to a long spiel about how I have Crohn's and there never is "just a cold" anymore.
Today when people say it to me, I just roll my eyes, shake my head and smile...sort of.
I wish I could "just have a cold" like I use to 30 years ago, gone are the days of catching a cold and take some medicine. The cold medicines that use to help me now cause me problems, either with pain, discomfort or major diarrhea.
I caught a cold the other day and I had a sore throat that felt as though something was stuck in there; my voice sounded like Barry White.....only deeper; a headache, but the sharp ones behind your eyes; runny nose, like a tap; cough that I feel in my chest, back and causes pain in my abdomen each and every time; muscle and joint pain that makes me feel like I'm 97 instead of 47; and dehydration that takes the wind out of me each and every time walking up stairs and, well.....just walking.
So, no, it's not just a cold. Maybe for all the "healthy" people it's just a cold, but maybe think twice before telling someone else, it's just a cold, you have no idea what a cold is.