From Dancing with Life by Phillip Moffitt:
The Pali word for craving is tanha, which means “thirst.” The Buddha identified three distinct kinds of tanha that you repeatedly experience; they are often unnoticed, because they arise and then are quickly preempted by yet another and then another.
First if your craving for the six kinds of sense desires, or kama tanha: craving for certain food tastes or for pleasing sounds or for silence; craving for sexual, affectionate, or comforting touch or simple physical comfort in your body; craving for attractive, pleasant, comforting, inspiring sights as well as for pleasant, refreshing smells; and finally, craving for thoughts that are confirming, useful, stimulating, and reassuring to you. Just think of how many different sense desires you have in any given moment!
The second type of craving is the desire for existence and for becoming what you are not. In Pali this is called bhava tanha. You may want to be wealthy, or more athletic, or sexually desirable, or a better musician. The craving to “become” can be wholesome—to be a good parent or a better friend to others, or to be more generous, healthier, or more disciplined—yet still cause suffering…
The third type of tanha arises when you are disillusioned with something in your life and want to get rid of it or want it to cease with such intensity that you crave nonexistence. This state of mind is called vibhava tanha. For instance, you may be so overwhelmed by chronic back pain or a difficult emotion that you are flooded with aversion to life itself. Or you have such antipathy toward your physical appearance, aging, or disease that life seems unbearable. In each of these instances, your nervous system is overcome by the energy generated by the craving, and it seems as if your whole being is rejecting existence. Vibhava tanha is annihilation. If you have ever felt suicidal, even briefly, then you have had flashes of vibhava tanha in the extreme. In its milder manifestations, vibhava tanha is part of everyday life. For example, you can feel so humiliated when you make a big mistake in front of others that for a brief moment your mind is filled with this craving.