Bhavarāga

Bhavarāga (T. srid pa'i 'dod chags སྲིད་པའི་འདོད་ཆགས་; C. you'ai 有愛) is translated as "attachment to existence," "desire for continued existence," "craving for continued existence," etc.

Saṃsāra, Nirvāṇa, and Buddha Nature states:

Attachment to existence is attachment to birth in the form and formless realms; it is possessed by beings in all three realms who cling to the bliss of concentration. A human may abandon attachment for sensual objects (kāmarāga) in the desire realm but have strong attachment for meditative states in the form and formless realms. Beings born in the form realm are attached to existence in that realm or to existence in the formless realm and will strive to actualize that level of meditative absorption. Beings born in the formless realm are attached to existence there, although not to existence in the desire or form realms. Because they still hanker for some samsaric existence, they lack the aspiration for liberation and cannot attain nirvana unless they relinquish that attachment.

Bhavarāga is identified as:

• one of the ten fetters
• one of the seven underlying tendencies (anuśaya)
• one of the "four floods" (Skt. ogha)

See also:

• attachment to existence in the form realm (rūparāga)
• attachment to existence in the formless realm (arūparāga)

Sources

• Buswell, Robert E.; Lopez, Donald S. (2014), The Princeton Dictionary of Buddhism, Princeton University 
• Dalai Lama; Thubten Chodron (2018b), Saṃsāra, Nirvāṇa, and Buddha Nature, The Library of Wisdom and Compassion, Volume 3, Wisdom Publications