Causes of blockages and narrow passages

Blockages sometimes occur because something foreign gets into the passage. It may be something unusual in kind, such as a stone, unusual in quantity, such as copious excrement, and unusual in quality because it is thick, viscous, or hardened, such as a congealed blood clot.

These are the types of things that clog the 6b passages when they fall into them. Among them there are those that remain in the channel in one place, those that fluctuate, and those that wander from place to place.

Blockage sometimes occurs because the passage is overgrown due to the healing of an existing ulcer in it, or because something extra has grown, for example, a warty, clogging lump of meat, or also due to the closure of the passage by a nearby pressing tumor. The cause of blockage can also be compression from extreme cold or from significant drying caused by astringent drugs, as well as from strong holding force or from the pressure of a tight bandage. In winter, blockages often occur due to the frequent retention of excess, as well as due to compression from the cold.