The phrase "unnecessary panic" means getting scared or worried about something that is not really a problem or threat, causing unnecessary stress and anxiety. Full definition
The European market is no doubt cheaper, as the debt crisis there has caused a lot of unnecessary panic selling. (begintoinvest.com)
It is still working to inform countries exactly what level 6 means and avoid unnecessary panic, he said. (sciencemag.org)
The more you know, the easier it is to avoid heart damage if chest pain does turn out to be a heart attack or unnecessary panic if it doesn't. (health.com)