Crab is a cold food and it is best for women not to eat crab during menstruation. Crab is extremely rich in trace elements and nutrients, and also contains a lot of protein. However, because of its cold properties, women who eat it during their menstrual period will have their uterus and ovaries stimulated to contract faster, which will lead to stagnant blood stasis and women will experience dysmenorrhea, reduced menstrual blood and prolonged periods. Especially for women with these conditions, eating crab will further aggravate the symptoms, so it is not recommended to eat crab during menstruation. In addition, after the end of the menstrual period, women must eat crab in a controlled amount, not more. Eating in moderation can be nutritious, but if too much is consumed, it can easily affect the digestive system and cause indigestion, abdominal pain, diarrhea and other symptoms.