Charak Samhita
करोति सततं हिक्कामेकद्वित्रिगुणं तथा । प्राणः स्रोतांसि मर्माणि संरुध्योष्माणमेव च ॥२३॥
It further produces remarkably loud and resonant hiccups occurring in bouts of two or three constantly. The blockage of pranavaha srotas (channels carrying prana).
english translation
karoti satataM hikkAmekadvitriguNaM tathA । prANaH srotAMsi marmANi saMrudhyoSmANameva ca ॥23॥
hk transliteration by Sanscript