Charak Samhita
स्निग्धोष्णमुष्णरूक्षं च रक्तपित्तस्य कारणम्। अधोगस्योत्तरं प्रायः, पूर्वं स्यादूर्ध्वगस्य तु ॥२३॥
Raktapitta is caused by food having predominantly unctuous-hot and rough-hot properties. The former often gives rise to the upward movement and the latter to the downward movement of raktapitta.
english translation
snigdhoSNamuSNarUkSaM ca raktapittasya kAraNam। adhogasyottaraM prAyaH, pUrvaM syAdUrdhvagasya tu ॥23॥
hk transliteration by Sanscript