Most menstrual cramps are caused by coldness, and the menstrual period is when your body is most deficient. During menstruation, your blood and qi are being expelled, and your body is at its weakest. If you wear less or eat cold foods such as ice cream, coldness will accumulate in your stomach. In traditional Chinese medicine, the stomach is called the source of bone marrow biochemistry. That is to say, the source of your blood production is already cold, and cold will condense in your blood, causing your menstrual pain.
一般的痛经都是由寒引起的，月经期又是你身体最亏虚的时候，你在月经的时候你的血气正在排出来，身体最弱的时候，如果这时候你穿得少或者吃冰淇淋等寒性食物，寒就聚集在你的胃当中，中医里胃叫作髓骨生化之源。也就是说你造血的源头就已经寒了，寒就会在你的血液当中凝结，从而造成你的痛经。