We present an in depth analysis of the transient events, or glitches,\ndetected at a rate of about one per day in the differential acceleration data\nof LISA Pathfinder. We show that these glitches fall in two rather distinct\ncategories: fast transients in the interferometric motion readout on one side,\nand true force transient events on the other. The former are fast and rare in\nordinary conditions. The second may last from seconds to hours and constitute\nthe majority of the glitches. We present an analysis o…