Ashtangasamgraha 11.45

11.45

udgāraśuddhirutsāho vegotsargo yathocitaḥ |

laghutā kṣutpipāsa ca jīrṇāhārasya lakṣaṇam ||

utpadyāśu vinaśyanti na cirātsa vinaśyati ||

ūrdhvādhovātarodhena tamānāhaṃ pracakṣate ||

Purity of belching, enthusiasm, proper evacuation of natural urges, / lightness, hunger, and thirst are the signs of digested food. // Arising quickly, they perish; before long, he perishes. // From obstruction of upward and downward flatus, they call it ānāha [intestinal obstruction].