Obstruction or congealing of Blood (ecchymosis) usually occurs as the end result of prolonged Blood congestion. This severe form of Blood stasis is considered to be one of the most, if not the most, critical pathogenic process forming the root of such problems as hemorrhagic endometritis, endometriosis, cancer, angina pectoris, severe migraine, post-stroke dementia and paralysis, intractable pain, scleroderma, and cirrhosis. Blood obstruction usually evolves gradually from chronic congestion of Qi or Moisture. It may, however, occur suddenly as a result of external trauma or internal damage by Wind, Heat, or Phlegm, that blocks the channels and vessels - especially those of the heart and brain. Regardless of the predisposing conditions, Blood obstruction is an entity that needs to be treated aggressively to prevent serious crises and to resolve many complex or intractable disorders. Purge Blood [Purge Red River] vigorously mobilizes Blood, breaks up congealed Blood, alleviates pain and swelling, promotes the formation of new Blood, and eliminated old or toxic Blood via the uterus and eliminative organs.*