Many people walking into an exam after a head injury or a long run of headaches are asked the same kinds of questions: when it started, where it hurts, what makes it better or worse. Caffeine is one detail that often gets lost. Coffee, tea, soda, and energy drinks are part of most routines, and a change in them can slip past memory entirely. This guide is about writing those habits down so you bring something concrete to the room.
This is educational only. It does not tell you what is causing your symptoms, and it does not replace an exam by a clinician who can examine you in person. If you have new weakness, confusion, trouble speaking, a sudden severe headache, vomiting that will not stop, or any symptom that frightens you, get emergency care now rather than waiting for a booked visit.
Why caffeine belongs on the page
Your daily drinks form a background pattern. When that pattern shifts, the shift itself can be informative. A week when you drank more than usual, a week when you stopped suddenly, or a week when you switched from coffee to an energy drink are all changes an examiner may want to hear about. None of these changes proves anything. They simply give the clinician a timeline to compare against your headaches.
Caffeine also appears in places people do not expect, including some over-the-counter combination products and certain sodas and tea blends. Check the labels on anything you keep at home or at work.
Set up a simple log
You do not need an app. A notebook page or a note on your phone works. Make one line per day with three parts: the date, the drinks, and a rough count of cups or cans. Write what you actually drank, not what you meant to drink. If you were unsure how big a cup was, write 'large' or 'small' and move on.
Add a second column for the time of your first caffeinated drink and your last one. Late-day caffeine can affect sleep for some people, and sleep is one more thing an examiner may ask about. Note it plainly, without adjectives.
What to write next to each day
Beside each line, add one short note about your head. Write whether you had a headache, roughly when it started, and whether it was worse, the same, or better than the day before. If you took any medicine for it, record the name and the time on the same line. Keep the wording flat. 'Headache from late morning, similar to yesterday' is more useful than 'awful all day.'
Log the days you skipped caffeine as well. Blank entries are hard to interpret later, and a day with no drinks is still information.
Bring it to your visit
Print the log or copy it onto one page. Put the earliest date at the top and the most recent at the bottom. Mark any day that stands out, whether because you changed your intake, had a headache, or both. Bring a list of the medicines and supplements you take, including any caffeine-containing products, since those often get missed.
Plan to hand over the page early in the appointment, or read it aloud. If the paper is hard to read because of light or screens, ask for a few minutes to go through it with your companion or a staff member. A short written summary is easier to follow than a long memory.
Keep it steady
A log is only useful if it is honest and consistent. Do not start cutting caffeine in the week before your visit just to make a point, and do not hide your normal habits. Write down what happened. The goal is a clear record of your ordinary days, so the examiner can see what is typical for you and what has changed.
If your St. Louis appointment is coming up this week, start today with a single line. One day of honest notes is more helpful than a perfect week you never finish.