We've become a habit of pinching one's nose if ya feel upset him or even pinches the nose on its own if it feels itchy. If the pinching the nose done too strong then it can endanger the health of the why, because it can bend the cartilage which divides between left and right nostril.
Hence the nasal cavity we will feels clogged and mucosa or mucous produced sinus cavities are experiencing barriers towards the nasal cavity. As a result you will be affected by sinusitis and the only way to cure it through surgery, because the nasal bones are bent it will not be straight back only with medication.