Reegis According to my knowledge 'flu' is uncountable, and 'fever' and 'headache' might be either countable or uncountable. ] zero article before 'flu' Yes but, some people add "the" before flu, especially in American English. It's like the American use of "the hospital", even when not mentioning one in particular.
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ReegisAccording to my knowledge 'flu' is uncountable, and 'fever' and 'headache' might be either countable or uncountable. So, there should be [a/the?] zero article before 'flu'Yes but, some people add "the" before flu, especially in American English. It's like the American use of "the hospital", even when not mentioning one in particular.
ReegisThe most typical symptoms of flu are [article] fever and [article] headache.Use a before "fever" and "headache".