Tremors (Shaking): Types, Causes, and Treatment - Patient

A tremor is a shaking or trembling in your body which you are unable to control. Anxiety, fear, feeling generally unwell and fever can all make you feel trembly - the expression 'shaking in his boots' is one we all recognise. Of course, feeling shaky without knowing what's causing it can make you feel anxious - which can lead to a vicious cycle of shakiness.

Source: patient.info