The physiological period can not eat crayfish, the reasons are as follows: 1, crayfish is a cold food, women in the menstrual period is best not to eat cold food, so as not to cause dysmenorrhea resulting in discomfort. And may cause changes in the amount of menstruation, resulting in a reduction in the amount of menstruation or prolonged menstruation. 2, crayfish contain more pathogenic microorganisms, if the processing process is not complete, it is easy to make pathogenic microorganisms into the gastrointestinal tract causing diarrhea and other symptoms. 3, crayfish in the processing process in order to deodorize and seasoning, easy to add chili and other irritating condiments. Eating spicy, irritating food during menstruation can easily cause increased menstrual flow and damage to the gastrointestinal mucosa. It is advisable not to eat crayfish during menstruation, you can eat more warm food, such as chicken soup, fish soup, etc., while drinking more water and eating more vegetables and fruits.