This is the 2229th most frequent Chinese word.
生病
"To be sick" or "to fall ill."
The word "生病" here means "to get sick," indicating that the subject has started experiencing symptoms of illness.
我开始发烧和咳嗽，可能是生病了。
I started having a fever and coughing, maybe I got sick.
The word "生病" in this sentence is used to describe someone being in a state of illness, as advice is given for that scenario.
如果你生病了，最好去看医生。
If you are sick, it's best to see a doctor.
In this context, "生病" refers to the condition of being sick, and the sentence provides general care instructions for such situations.