Other problems associated with severe doglegs are wearing of tool joints and worn spots in the casing which can lead to collapse or a hole in the casing.
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As drilling continues, the drill string tension in the dogleg increases which increases the lateral force.
The lateral force causes the drill string to cut into the wellbore wall at the dogleg (refer figure below).
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The dogleg severity is low if the changes in inclination and/or azimuth are small or occur over a long interval of course length.
The dogleg severity is high when the inclination and/or azimuth changes quickly or occur over a short interval of course length.
Since the drill pipe is in rotational as well as performs linear motion, the drill string experiences both TORQUE & DRAG.