I'm worried about nasal congestion.

I don't have rhinitis, but sometimes I experience severe nasal congestion, which makes my nose feel blocked, and I keep coughing as a result.

Do you experience severe phlegm and fever when it gets worse and becomes difficult to swallow?

When you go to the hospital for a blocked nose, they tell you not to blow your nose, because it can strain the nasal mucosa and cause a nosebleed.

They say it's not good, but it feels frustrating, so I often just blow my nose and feel relieved afterward. However, I was told that's not the right way. I'm curious about what to do when nasal congestion is severe, and whether there are any preventive measures or management methods.