Kundalini causes the most sensation when it enters an area of mind or body that is blocked. But the heat generated by the friction of Kundalini against the resistance soon burns out the block, and then the sensation ceases. Similarly, just as the intense flow of water through a small rubber hose will cause the hose to whip about violently, while the same water through a fire hose would scarcely be noticed, so does the flow of Kundalini through obstructed channels within the body or mind cause motions of those areas until the obstructions have been washed out and the channels widened.” 
1.Dr Lee Sanella , Kundalini: Psychosis or Transcendence. Pg 12.
Kundalini 101- the basics