Menstrual flu is caused by the decrease of resistance and immunity during menstruation, which can lead to symptoms of flu, such as dizziness, headache, nasal congestion, runny nose, weakness, general aches and pains, and also because menstrual blood will flow during menstruation, and the body’s blood volume will decrease. These symptoms will gradually improve after the period, so it is recommended to avoid exertion during menstruation, pay attention to warmth and get enough sleep; diet should be strengthened, avoid spicy, stimulating and cold food. If the blood volume of each menstrual period is high, you need to go to the hospital for blood cell analysis to understand whether the anemia, because anemia will lead to a decrease in the body’s immunity will also appear cold symptoms, you need to take oral blood medicine to correct anemia and strengthen the body’s immunity. In addition, you should pay attention to personal hygiene during menstruation and keep your vulva clean.