Headache during menstruation may be caused by lack of oxygen in the brain due to heavy bleeding during menstruation, changes in hormone levels in the body or excessive stress in work and life, which need to be analyzed specifically. 1. Lack of oxygen to the brain: some women have heavy bleeding during menstruation and the blood supply to the brain is not enough, which causes lack of oxygen to the brain, thus causing headache. 2. Changes in hormone levels in the body: the hormone levels in the body fluctuate greatly during menstruation, for example, the endometrial shedding will cause the release of prostaglandins, which on the one hand will cause the uterus to contract, and on the other hand, will also cause blood vessel constriction, so there will be a headache. 3. Excessive pressure at work and in life: During menstruation, women’s bodies are weaker, and if the pressure at work and in life is too great, it is easy to put the nerves in a state of tension, thus causing headaches. Headaches during menstruation may also have other causes, it is recommended to pay attention to rest during menstruation and avoid overwork. If you have a headache during menstruation and it is difficult to relieve, you can go to the hospital and take the appropriate amount of medication under the guidance of the doctor.