Railings may be loose because of
Railings that are loose are even more dangerous than those that are missing, because they provide a false sense of security. When checking the safety of your railings, use each railing and pull on it with progressive and considerable force to ensure that it is secure. Do not lean on a railing or push out on it in such a way that if it lets go, you would fall. Railings that are freestanding at one or both ends are much more difficult to build well. Pay particular attention to these.
Metal railings on concrete surfaces usually rust first at their point of penetration into a concrete base. The rusting metal expands and, in some cases, cracks the concrete. The railing may not be very strong. Watch also for damaged concrete where metal railings are attached. While guards may not be required unless the steps, deck or landing are more than 24 to 30 inches above grade, falling backwards off a deck two feet above the ground is dangerous. When in doubt, add more guards.