People have headaches after crying because of lack of oxygen, so they can be relieved by the following ways: 1. You can breathe a lot of fresh air or do exercise outdoors, and aerobic exercise is recommended. By breathing a lot of fresh air and doing aerobic exercise to improve the body oxygenation, in order to increase the body’s blood oxygen saturation, improve the headache caused by lack of oxygen. If the headache is still not relieved after doing exercise or breathing fresh air, it is recommended to go to the hospital to perform shielded oxygen inhalation treatment. 2. If the headache is caused by insufficient blood supply to the brain after crying, you can take certain drugs to improve the blood supply to relieve it. For example, you can take gold nadol tablets, ginkgo biloba or ori baoque, min make lang can relieve the headache, you can also take non-steroidal anti-inflammatory drugs, such as Somi pain tablets, celebrex tablets can relieve the headache after crying.