Yes, stopping drinking alcohol can cause headaches. Alcohol is a diuretic, which means it can cause dehydration, and dehydration can lead to headaches. When someone stops drinking alcohol, they may experience a withdrawal period, which can include headaches as a symptom. In addition, alcohol can cause blood vessels to expand, and when someone stops drinking, those vessels can constrict, causing headaches. It’s important to note that headaches can also be a symptom of other health conditions, so it’s always best to speak with a medical professional if you are experiencing frequent or severe headaches.