If crabs are eaten in moderation and during the non-menstrual period, they will not affect menstruation. If you eat crabs regularly, it may affect your menstruation because crabs are cold and cold foods, and if you eat them every day, it may cause your menstrual cycle to lengthen. In addition, if you eat crabs during your menstrual period, you should eat crabs in moderation as they belong to the cold and cold food, which will lead to the possibility of menstrual cramps, and it is best not to eat crabs during your menstrual period. It is also recommended that when eating crabs, it is best to dip them in a little bit of ginger paste or zhejiang vinegar to reduce the coldness of crabs. If you have allergies to crabs, such as protein allergy is not recommended to eat crabs again.