Sometimes the weight of the lenses and glasses will account for your painful nose. If the nose pads are too large for your nose, they may squeeze or pinch your nose. And this can lead to pain. If the glasses are very cheap, the material of the glasses can't be very good and usually they are very heavy. The heavy glasses will definitely cause pain on your nose if you wear them for a long time. we know that glasses are made by different materials. I bought a pair of titamium glasses last week. I think it is very good because the titamium frames are very light. it will not put too much pressure on my nose. This makes me feel more comfortable.