There are many ways to describe the causes of suffering, of different levels for different kinds of practitioners or personalities. But as Tibetan Buddhism is based on the Mahayana tradition, let's take this explanation. The following six step presentation will cover many entries, but to start with let's introduce the sources.
This presentation was given by byams pa, Maitreya.
In the Buddhist tradition, byams pa is a soon to become enlightened being (Buddha). byams also means love. It's pronounced Jampa, hence why many Tibetan monks have this auspicious name.
byams pa gave this teaching to thogs med, Asanga, an important Buddhist teacher who lived around 300 CE. thogs med means unhindered.
Next the name of the text, it's a mouth full!