The term 'dukkha' in Tibetan (sdug bsngal) and in Sanskrit and Pali - is a Buddhist term commonly translated as 'suffering', one of the most important concepts in the Buddhist tradition and in the Yoga Sutras of Patanjali.
http://en.wikipedia.org/wiki/Dukkha "All is suffering for the wise man" (Y.S. 2.15). The most ancient sustained expression of yogic ideas is found in the early discourses of the historical Buddha, thus Patanjali's conception of freedom is related to the ancient Buddhist view that the source of suffering is the craving for permanence in a universe of impermanence. Both the 'Four Noble Truths' and the 'Eightfold Path' articulated in the Buddha's first discourse are elements that underlie the yoga system. Two striking examples of this are Patanjali's use of the word nirodha in the opening definition of yoga as citta-vrtti-nirodha, that is, 'Yoga is the cessation of the turnings of thought' and the statement that "all is suffering, dukkha, for the wise man." According to Stoler-Miller,"... dukkha, suffering, and nirodha, cessation, are crucial terms in Buddhist vocabulary and the doctrine of suffering is the core of what Buddhists believe the Buddha taught after gaining enlightenment. Patanjali's ashtang eight-limbed practice is parallel to the eight-limbed path of Buddha." Work cited: 'Yoga: Discipline of Freedom' by Barbara Stoler-Miller Acclaimed translator of the Bhagavad Gita. Bantam Wisdom Editions 1998 p. 5, 52.
