Garudapurana 1.168.17

1.168.17

madhuro lavaṇaḥ snigdho guruḥ śleṣamātipicchilaḥ /
gudaśroṇyāśrayo vāyuḥ pittaṃ pakvāśayasthitam //

phlegm is sweet, salty, unctuous, heavy, and extremely slimy. / Vāyu resides in the rectum and pelvis; pitta is located in the small intestine;