I used to be able to drink alcohol, mostly beer, quite often with no problem for most of my life, but lately i get a bad headache almost immediately when i start drinking. why is that?

Alcohol headache: I understand your discomfort. According to the National Headache Foundation, the ethanol in alcoholic beverages may cause the body to lose fluid and cause Dehydration, a change in the balance of body water and essential nutrients. Please reflect: Reasons to use Alcohol Stresses in life Unresolved feelings and conflicts Boredom Loneliness Discomfort in social situations See a Therapist.