Menstruation quantity is always too little, color black how is this to return a responsibility ah

Menstruation volume is always too little, color is black, consider it is caused by qi stagnation and blood stasis, or it is caused by palace cold, mainly due to cold stimulation of the abdomen; usually should do a good job of abdominal warmth, appropriate drinking ginger brown sugar water, can alleviate symptoms, and to the regular hospital gynecology.