It's acceptable, but it's best to use lukewarm water and dry your hair promptly afterward. During menstruation, a woman's body has reduced resistance. Otherwise, it can easily affect your health, potentially leading to gynecological issues and migraines. The belief that washing your hair during menstruation is forbidden is merely a folk tale. In ancient times, women had very long hair and lacked modern tools like hair dryers. Hair took a long time to dry, and the dampness could affect the head, potentially triggering headaches.
Generally, intercourse during menstruation does not result in pregnancy. Since ovulation does not occur during menstruation, there is no egg available for sperm to fertilize. Therefore, pregnancy cannot occur during this period.
The menstrual cycle includes the menstrual phase, ovulation phase, and fertile window.A woman can conceive primarily during ovulation when an egg is released and can be fertilized by sperm. Under normal circumstances, a woman ovulates only once per month, releasing a single egg. Therefore, the chance of pregnancy during menstruation is low. However, if medications like birth control pills cause menstrual irregularities, ovulation may occur during menstruation, though this is rare.
It is important to note that intercourse should be avoided during menstruation. This is because the uterine lining forms an open wound during menstruation, and the body's overall immunity is lowered, making it more susceptible to inflammatory infections such as pelvic inflammatory disease (PID) and adnexitis. Additionally, uterine contractions during sexual arousal may cause menstrual blood to flow backward into the pelvic cavity, potentially leading to endometrial implantation and endometriosis. Therefore, abstaining from sexual activity during menstruation is recommended.