1. onset age: oblique hernia is more common in children and young adults; Straight hernia is more common in the elderly.
2. Herniation mode: Oblique hernia protrudes through inguinal canal and can enter scrotum; Straight hernia is a triangular protrusion of straight hernia and does not enter the scrotum.
3. The shape of hernia block: the hernia block of indirect hernia is oval or pear-shaped, and the upper part is pedicled; The hernia mass of direct hernia is hemispherical with a wide bottom.
4. Press the hernia ring after receiving the hernia block: the oblique hernia can no longer protrude; The hernia mass of direct hernia can still protrude.
5. Relationship between spermatic cord and hernia sac: When oblique hernia occurs, the spermatic cord is behind the hernia sac; In direct hernia, the spermatic cord is in front of the hernia sac.
6. Relationship between hernia sac neck and inferior epigastric artery: The hernia sac neck of indirect hernia is outside the inferior epigastric artery; The neck of hernia sac of direct hernia is in the inferior epigastric artery.
7. Opportunities for incarceration: Oblique hernia has more opportunities for incarceration; The possibility of direct hernia incarceration is very small.