A 'Trend' is a large social influence if this is what you are talking about. Trends are something where one person does/wears it (usually a popular person everyone likes) and then everyone else starts doing it.
Answer:
Has trouble breathing or is breathing in a strange way.
Has chest pain or pressure.
Has injuries to the head, neck, or back.
Has gone into shock.
Is or becomes unconscious
Coughing.
Clumsiness
I would say a , shots to protect against the flu is the best you can get
