user4928: You will often hear reference to the three poisons in Buddhism, What are they referring to exactly when they talk about the three poisons? 

user715: The three poisons (Sanskrit: triviṣa; Tibetan: dug gsum) or the three unwholesome roots (Sanskrit: akuśala-mūla; Pāli: akusala-mūla), in Buddhism, refer to the three root kleshas of ignorance, attachment, and aversion. These three poisons are considered to be the cause of suffering (Sanskrit: dukkha).
Source: Three poisons (Buddhism) - Wikipedia
They are commonly circumvented by contemplating on the three characteristics or marks of all existence - anicca, anatta and dukkha. See this talk in the Burmese vipassana tradition.
See also, kleshas

user-1: 
Three Poisons/Defilements (Kilesas – lit. torments of the mind):
Greed (lobha) – mindfulness transforms this into Faith
Aversion/hatred (dosa) – mindfulness transforms this into discriminating Wisdom
Delusion (moha) – mindfulness transforms this into Equanimity

Ven. Bhikkhu Bodhi treats these poisons/kilesas on a deeper level in his book The Noble Eightfold Path, p. 8, 80-81:

The most basic defilements are the triad of greed, aversion, and delusion.
Greed (lobha) is self-centered desire: the desire for pleasure and possessions, the drive for survival, the urge to bolster the sense of ego with power, status, and prestige.
Aversion (dosa) signifies the response of negation, expressed as rejection, irritation, condemnation, hatred, enmity, anger, and violence.
Delusion (moha) means mental darkness: the thick coat of insensitivity which blocks out clear understanding.
From these three roots emerge the various other defilements — conceit, jealousy, ambition, lethargy, arrogance, and the rest — and from all these defilements together, the roots and the branches, comes dukkha in its diverse forms: as pain and sorrow, as fear and discontent, as the aimless drifting through the round of birth and death. To gain freedom from suffering, therefore,
we have to eliminate the defilements. But the work of removing the defilements has to proceed in a methodical way. It cannot be accomplished simply by an act of will, by wanting them to go away. The work must be guided by investigation. We have to find out what the defilements depend upon and then see how it lies within our power to remove their support.

And also very importantly how to deal with the defilements:

"...the root defilements is conditioned by a particular kind of feeling: greed by pleasant feeling, aversion by painful feeling, delusion by neutral feeling.
But the link between feelings and the defilements is not a necessary one. Pleasure does not always have to lead to greed, pain to aversion, neutral feeling to delusion. The tie between them can be snapped, and one essential means for snapping it is mindfulness. Feeling will stir up a defilement only when it is not noticed, when it is indulged rather than observed. By turning it into an object of observation, mindfulness defuses the feeling so that it cannot provoke an unwholesome response..."


4928: <p>You will often hear reference to the three poisons in Buddhism, What are they referring to exactly when they talk about the three poisons? </p>
 715: <p>The <strong>three poisons</strong> (<em>Sanskrit: triviṣa; Tibetan: dug gsum</em>) or the <strong>three unwholesome roots</strong> (<em>Sanskrit: akuśala-mūla; Pāli: akusala-mūla</em>), in Buddhism, refer to the <strong>three root kleshas</strong> of <strong><em>ignorance, attachment, and aversion</em></strong>. These three poisons are considered to be the <strong>cause of suffering</strong> (<em>Sanskrit: dukkha</em>).</p>

<p>Source: <a href="https://en.wikipedia.org/wiki/Three_poisons_(Buddhism)" rel="nofollow">Three poisons (Buddhism) - Wikipedia</a></p>

<p>They are commonly circumvented by contemplating on the three characteristics or marks of all existence - <em>anicca, anatta</em> and <em>dukkha</em>. See <a href="http://www.buddhanet.net/vmed_8.htm" rel="nofollow">this talk</a> in the Burmese vipassana tradition.</p>

<p>See also, <a href="http://www.buddhanet.net/vmed_8.htm" rel="nofollow">kleshas</a></p>
 -1: <blockquote>
<p><a href="http://www.insightmeditationcenter.org/books-articles/dhamma-lists/#formjhanas" rel="nofollow noreferrer"><strong>Three Poisons/Defilements (Kilesas – lit. torments of the mind)</strong></a>:</p>
<p>Greed (lobha) – mindfulness transforms this into Faith</p>
<p>Aversion/hatred (dosa) – mindfulness transforms this into discriminating Wisdom</p>
<p>Delusion (moha) – mindfulness transforms this into Equanimity</p>
</blockquote>
<p>Ven. Bhikkhu Bodhi treats these poisons/kilesas on a deeper level in his book <a href="http://www.buddhanet.net/pdf_file/noble8path6.pdf" rel="nofollow noreferrer">The Noble Eightfold Path</a>, p. 8, 80-81:</p>
<blockquote>
<p><strong>The most basic defilements are the triad of greed, aversion, and delusion.</strong></p>
<p>Greed (lobha) is self-centered desire: the desire for pleasure and possessions, the drive for survival, the urge to bolster the sense of ego with power, status, and prestige.</p>
<p>Aversion (dosa) signifies the response of negation, expressed as rejection, irritation, condemnation, hatred, enmity, anger, and violence.</p>
<p>Delusion (moha) means mental darkness: the thick coat of insensitivity which blocks out clear understanding.</p>
<p>From these three roots emerge the various other defilements — conceit, jealousy, ambition, lethargy, arrogance, and the rest — and from all these defilements together, the roots and the branches, comes dukkha in its diverse forms: as pain and sorrow, as fear and discontent, as the aimless drifting through the round of birth and death. To gain freedom from suffering, therefore,
we have to eliminate the defilements. But the work of removing the defilements has to proceed in a methodical way. It cannot be accomplished simply by an act of will, by wanting them to go away. The work must be guided by investigation. We have to find out what the defilements depend upon and then see how it lies within our power to remove their support.</p>
</blockquote>
<p>And also very importantly how to deal with the defilements:</p>
<blockquote>
<p>&quot;...the root defilements is conditioned by a particular kind of feeling: greed by pleasant feeling, aversion by painful feeling, delusion by neutral feeling.
But the link between feelings and the defilements is not a necessary one. Pleasure does not always have to lead to greed, pain to aversion, neutral feeling to delusion. The tie between them can be snapped, and one essential means for snapping it is mindfulness. Feeling will stir up a defilement only when it is not noticed, when it is indulged rather than observed. By turning it into an object of observation, mindfulness defuses the feeling so that it cannot provoke an unwholesome response...&quot;</p>
</blockquote>
