You should not donate blood during menstruation for the following reasons: First, during menstruation itself, women will lose some blood due to menstruation, and some women have a relatively large amount of menstruation. If women donate blood during this period, it may cause serious trauma to the body due to excessive blood loss, which may cause dizziness, nausea, vomiting or even have adverse effects on menstruation. Secondly, some women are physically weak and menstruation itself is an exertion of the organism, so if they donate blood during menstruation, it may cause anemia, even hypotensive shock and other adverse reactions. Thirdly, during menstruation, women’s bodies are relatively sensitive to external stimuli, including painful stimuli, and donating blood at this time may cause infection in women.