If there’s one thing you don’t want to endure, it’s the symptoms of norovirus, a brutal stomach bug that tends to cause relentless diarrhea and vomiting for roughly one to three hellish days. And it may be especially difficult to avoid right now,

The surge of norovirus —more commonly known as a “stomach bug” or the “stomach flu,” is at it again. The virus is most prevalent during the winter season, so more cases have popped up since December or so.

If you’ve been sick to your stomach that the holidays are over, it may not be the passing of another holiday season but an actual illness as the norovirus is spreading nationwide, according to the CDC.

Norovirus cases are surging in the US, the CDC says. Here are the symptoms to look for, plus how long you're contagious for, per an infectious disease doctor.