A technique for addressing this specific problem is meditation with what are called asanas. This is where you pick a position in which to put your body, and during the time of meditation you do not move your body AT ALL. Perhaps slowing the mind would be good as well, but that is not the primary purpose of this mediation. The purpose is to keep your body absolutely still throughout the meditation. You cannot itch, you cannot address any discomfort, you cannot move at all.
Now, your nervous system/brain works largely through feedback loops. This means that feedback is a cue for persistence of the existing processes. If
you address the itch, or do any movement in response to some physical sensation, you are giving your brain a cue to continue these sensations. Through
absolutely ignoring them, keeping your body absolutely still in the asana no matter what, your brain can learn to basically close these bodily
feedback loops down.
This is the attainment of the asana. If you can accomplish this, your nervous system will basically cease sending signals to your body, and there will
be no distractions while you are in the asana. Because of this, intense physical bliss is possible. Also because of this, high states of
consciousness, and intense spiritual or transcendental experiences become possible. These states come by your brain not being distracted by routine
functions. The more these distractions are removed, the more of your brain’s power can be directed towards intense experiences in consciousness.
Looking deeper yet, detaching from conceptual or emotional responses can close down deeper feedback loops in your cognitive functioning, which can
open up even deeper states of consciousness, even more transcendental experiences. Note that in this view, spirituality and science are reconciled.
Spiritual experiences are seen as being legitimate functions of the brain, which can be induced by specific techniques, and that our knowledge of all
of this can be expanded through scientific analysis.