Watermelon is not recommended for women during menstruation. Although watermelon quenches thirst, reduces fire and heat, and can replenish the water lost by the body, watermelon has cold properties among fruits, and women’s immunity will be relatively weak during menstruation, which can lead to abnormal menstruation in women. Women should not eat cold things during their periods. If women eat watermelon during their periods, the blood will be stimulated by the temperature, which will lead to poor circulation of menstrual blood and blood clots, causing blood gas and dysmenorrhea. Women should avoid stimulating raw, cold, spicy, indigestible food during their periods to avoid stimulating vasodilation and causing early or delayed periods. Women should eat nourishing, light, estrogen-rich, high-protein, blood-qi-supplementing, easy-to-digest foods during their periods, as well as a balanced diet.