Home Anal fistula Piles Anal fissure About us Feedback Contact us Overview Causes Disease process Symptoms Diagnosis Grading Treatment Prevention Myths Patient  Haemorrhoids(Piles)... Q What is Cryotherapy?    A cryogenic device uses liquid nitrogen to super freeze the hemorrhoid. This causes the affected tissue to slough off, so that new healthy tissue can grow in its place. This technique is most effective when it is used on external hemorrhoids.