Mind can play tricks.
When one really starts comprehending Dhamma (suffering and its root causes), one can start feeling it mentally and bodily. This is described in the described in the Upanisa Sutta (SN 12.23):
“..With the comprehension of suffering (i.e., the First Noble Truth via Tilakkhana) faith results; with the growth of faith, lightness of mind (pāmojjaṃ) arises; with increasing lightness of mind, joy (piti) arises; with increasing joy, lightness of the body (passaddhi) arises; with increasing passaddhi, bodily sukha arises; with increasing bodily sukha, samādhi arises; with samādhi, yathābhūtañāṇadassana (knowledge and vision of things as they really are) arises; with the knowledge and vision of things as they really are, one loses attachment to worldly things (nibbidā), followed by losing cravings for sense pleasures (viragā), and liberation (vimutti), and to the destruction of all defilements (khayeñāṇaṃ)”.
That step-by-step process takes one all the way to Arahanthood.