Astanga Hrudaya
कर्शनात् कफविट्पित्तैर्मार्गस्यावरणेन वा । वायुः कृताश्रयः कोष्ठे रौक्ष्यात्काठिन्यमागतः ॥ ३९ ॥
Either by weakness (due to loss or depletion of tissues) or by obstruction of its passage by kapha, vit (faeces) or pitta, vata gets aggravated, localized in the alimentary tract, due to dryness, becomes hard
english translation
karzanAt kaphaviTpittairmArgasyAvaraNena vA । vAyuH kRtAzrayaH koSThe raukSyAtkAThinyamAgataH ॥ 39 ॥
hk transliteration by Sanscript