Is yellow mucus dangerous for 3 weeks?

Yellow mucus can indicate a viral or bacterial infection, and if it persists for three weeks, it may be a sign of a more serious issue, such as a sinus infection or respiratory condition. While yellow mucus alone isn't necessarily dangerous, the duration and accompanying symptoms (like fever, pain, or difficulty breathing) should be monitored. It's advisable to consult a healthcare professional if the yellow mucus continues or worsens, especially if there are other concerning symptoms.