evidence: - This can be caused by different conditions, such as Bell’s palsy, or stroke. [...] In the case of a stroke, your facial droop will usually come on suddenly. Other muscles on one side of your body might also be affected. More stroke symptoms are: [...] If you have any of the stroke symptoms above, no matter how long they last, call triple zero (000) immediately and ask for an ambulance. If calling triple zero (000) does not work on your mobile phone, try calling 112.