“The effect depends less on coffee itself and more on the individual’s body, daily routine and migraine pattern,” Dr Vijayashankar says. Most headache specialists advise people to keep their caffeine intake moderate and consistent, generally limiting it to around 200 mg per day. “These withdrawal headaches can begin within 12 to 24 hours and are often accompanied by fatigue, irritability, poor concentration and excessive sleepiness,” he explains. Dr. Muralidhar says there is no one-size-fits-all answer. Dr Muralidhar quips, “The biggest misconception is that coffee is either universally good or bad.