While<unk>  helps to alleviate symptoms of the common cold and hayfever, when it is done excessively or incorrectly it may bring potential adverse health effects.<unk>  generates high pressure in the nostrils. When this pressure is added to a dry<unk> , it could rupture blood vessels inside the<unk> , resulting in a<unk> bleed. In a 2000 study, doctors squirted dense liquid dye, which could be seen on x-rays, into the<unk> s of several adult volunteers. The volunteers were induced to sneeze, cough, and blow their<unk> s. It was found that the typical pressure of<unk>  was 1.3 pounds per square inch, ten times greater than that generated by sneezing or coughing. CT scans showed that<unk>  sent much of the dye into the paranasal sinuses rather than expelling it out of the<unk> . The doctors suspected that<unk>  may increase the risk of sinus infections by sending bacteria-filled mucus into the sinuses. In extremely rare but documented cases,<unk>  has resulted in unusual conditions, such as in the case of a woman who fractured her left eye socket after<unk>  her<unk> .
Nose-blowing
Oil pulling
Crawling 
Chafing 
Gestaltzerfall
Tongue thrust
Bursting
Pressure of speech