A City Guide To Pingdu for children at this stage understand that illness can have multiple symptoms, and they recognise that germs, or even their own behaviour, can cause illness e.g. You get a cold if you take your jacket off outside, and it gets into your body’. n Internalisation i.e. illness is within the body, but the process by which symptoms occur can be partially understood. The cause of a cold may come from outside germs that are inhaled or swallowed. A City Guide To Pingdu 2016.