paralysis, numbness
痹 centers on loss of sensation or control in the body: paralysis and numbness. Both meanings describe a state where normal feeling or movement is blocked.
痹 combines 疒 (sickness) with 畀, which likely contributes the sound. The character expresses illness involving loss of sensation or movement.
The sickness enclosure 疒 wraps around 畀, like a body trapped in numbness. Imagine a person whose limbs are locked inside an invisible cage of paralysis.
For ヒ, picture a person with paralysis feeling the heat (hi) of a warming pad on their numb skin: heat -> ヒ, and the warmth tries to break through the numbness.