I have had a blocked nose for a month and green mucus in comming out when i blow what could this be.

Xlear: Your doc may tell you that you have a sinus infection. You can use a natural product called xlear (pronounced "clear") to clean out nasal passages and break up the biofilm where germs multiply. Tastes good too!

Nasal problem 1 mo: This could be an infection or irritation of the nose or sinuses. The green mucous may or may not be an infection. Because this has gone on a month or so, you need to see your doctor to diagnose the problem and treat you as necessary.

Unpleasant!: Set up for bacterial sinusitis, which requires diagnosis, perhaps with x-ray confirmation, and antibiotics to clear. Rarely surgery, but possible.

You need a diagnosis: You need an ENT doctor to thoroughly inspect your nose with an endoscope. Possibilities range from nasal allergy to rhino-sinusitis to nasal polyps, to foreign body to specific gramulomas, to name a few. Therefore, you need a diagnosis before treatment can be instituted.