When an imbalance is going on acupuncture the powerful approach to set it right. Periods that will almost always too long can be shortened once the underlying imbalance is covered. Cycles that are too short (say, a 3-week period long) can be lengthened when that imbalance is changed. Heavy cramping during the menstrual period can be addressed in this way as well.
dangers of acupuncture endorphins to decrease your pain and neurotransmitters for recovery process. So there was indeed some scientific basis for the treatment.
As your course of treatment progresses the level of relief and the time time period reduced symptoms following each visit turn out to be more definite, until we are all are beared.