Headaches can occur after quitting alcohol, called withdrawal syndrome, which usually subsides or goes away in about two weeks. However, it may also be caused by other reasons, such as sleep deprivation and brain diseases. 1. Alcohol withdrawal syndrome: After quitting drinking, the central nervous system loses the inhibitory effect of alcohol on the nerves, resulting in excessive excitation of the cerebral cortex, which leads to the occurrence of headaches. Generally, it can be relieved or disappear in about two weeks after quitting drinking. The specific situation varies from person to person, and the length of time of drinking has a certain relationship with their own physical and other factors. 2. Lack of sleep: If insomnia and lack of sleep occur after quitting drinking, headaches, dizziness, fatigue and other discomforts may occur, which should be rested, and develop good habits of work and rest, go to bed early and get up early. 3. Brain diseases: headache after quitting drinking may not be related to quitting drinking, such as brain diseases can also cause headache, the most common brain diseases are hypertension, stroke, craniocerebral tumors, etc., you need to seek medical treatment as soon as possible to do the relevant examination to make a clear diagnosis, and you can take medication or surgical treatment. If the symptoms of headache after quitting alcohol persist, it is recommended to consult a doctor in time, and give active treatment after clear diagnosis.