Is ice cream harmful for people having cough and cold?

I actually don't think you're supposed to eat ice cream when you're sick, but not because of the temperature. Dairy creates phlegm in your chest and throat, which usually isn't noticeable when you're healthy, but if you already have a cold or cough, eating dairy will make it last longer and could make it get worse.

As long as it doesn't feel uncomfortable, and/or make your cold and/or cough worse, it should be fine. I think it's nice to have tasty food and treats when you're sick, they're comforting and make the whole process of recovery a little more pleasant .

I don't think any food is inherently "bad" for you; it just depends how much and how often you have it. Three or four days a week for ice-cream sounds fine. There are far worse things you could end a meal with! Just enjoy it and don't worry.