Flexible Economy is a new enhanced Economy service operating on a single cabin aircraft for customers on our shorthaul network flying to and from London Heathrow.
Although caffeine is generally safe and well tolerated, it can cause side effects when ingested in large doses. Additionally, regular caffeine use can cause dependency, resulting in withdrawal symptoms when caffeine is not consumed. Headaches can be a symptom of either too much caffeine or too little.
Difference between cluster headache and migraines. Migraines are typically made worse by physical activity, cause throbbing pain and occurs with at least one of the following migraine symptoms: nausea, vomiting, sensitivity to light and sensitivity to sound.