You should not donate blood during menstruation. Blood donation should only be done when you are in good health, and menstruation is a contraindication to blood donation. During menstruation, women are not in good health and may experience dizziness, weakness, stomach pain and other uncomfortable symptoms, and they may lose some of their blood during menstruation. If you donate blood at this time, the dizziness may be aggravated and some women may even faint or faint, so it is not suitable to donate blood during menstruation. You can donate blood only after your period has cleared and you are sure that your body is in normal condition and there are no other contraindications to donating blood. The amount of blood that a woman should donate at one time is not recommended to be too much, between 200-300ml, depending on her health condition.