Flu-like symptoms develop, e.g. diarrhea, nausea, fever, confusion, dizziness, weakness, and generally feeling bad.

出现类似流感的症状，例如腹泻、恶心、发烧、头晕，虚弱，同时自我感觉很不好。

youdao

Take them at the onset of cold or flu-like symptoms.

出现感冒或类似流感症状时就服用。

youdao

If your children are sick, have a fever and flu-like illness, they shouldn't go to school.

如果你的孩子生病了，发烧并且有流感的症状，他们不能再去学校了。

youdao

Others may get flu-like symptoms such as fever, muscle and joint pain and headaches.

VOA: special.2010.07.12

Here in Juarez, people with flu-like symptoms have formed long lines outside of some clinics and hospitals, even though there have been no confirmed cases of swine flu here.

VOA: standard.2009.04.30

Most players suffer through a flu-like illness or two at some point during the season.

WSJ: The Yanks Need Some Chicken Soup

Both medicines are similar to Avonex, and, like Avonex, they cause flu-like side effects.

FORBES: Biogen Idec Hits A Nerve

But side effects can include mild flu-like symptoms, including a runny nose or sore throat.

BBC: Flu vaccines for all children