The first reason for this is that crying affects one’s emotions, and emotional stimulation can lead to spasms of the cerebral blood vessels, which can cause headaches due to cerebral ischemia and hypoxia. Secondly, because the body does not get good rest due to crying, there will also be overworked headache. If it is caused by these two reasons, it is recommended to pay attention to good rest and adjust your mental state so as to ensure sufficient sleep, and this pain should be relieved soon. Another reason may be that when crying, the amount of nasal snot will increase and tears will also increase. Both nasal snot and tears originate from cerebrospinal fluid, and this may lead to a decrease in the amount of cerebrospinal fluid, resulting in a low cranial pressure headache, and if this is the cause, it is recommended that the headache will be slowly relieved as long as you lie down and rest.