Caffeine withdrawal: symptoms, day-by-day timeline and what helps

Key takeaways

• Withdrawal symptoms typically begin 12–24 hours after your last caffeine, peak at 20–51 hours and last 2–9 days.
• About half of people in experimental studies got a headache, and about 1 in 8 had symptoms that disrupted daily life.
• Stopping a habit as small as 100 mg a day, about one mug of instant coffee, has produced withdrawal symptoms.
• The FDA and MedlinePlus advise cutting back gradually, but no study has worked out the best speed for a taper.
• Severe symptoms, symptoms that don’t fit the timeline, or anything like chest pain or fainting need a doctor, not patience.

Caffeine withdrawal symptoms that research has confirmed

The most thorough look at caffeine withdrawal is a 2004 review by Juliano and Griffiths, which pooled 57 experimental and 9 survey studies. The authors tested 49 reported symptom categories against validity criteria. Ten passed:

Three more were judged likely to be genuine withdrawal symptoms: flu-like symptoms, nausea or vomiting, and muscle pain or stiffness. Things outside these lists may still happen to you, but they are not what the research shows as typical, so they deserve a closer look.

Headache is the best known. In the experimental studies, about 50% of people got a headache after stopping caffeine, and about 13% (roughly 1 in 8) had distress or impairment that was clinically significant, meaning it got in the way of work or daily life. Our guide to the caffeine withdrawal headache covers that symptom in detail.

• Headache
• Fatigue
• Decreased energy or activeness
• Decreased alertness
• Drowsiness
• Decreased contentedness
• Depressed mood
• Difficulty concentrating
• Irritability
• Feeling foggy or not clearheaded

Caffeine withdrawal timeline, hour by hour and day by day

The same review found a consistent pattern. Typically, symptoms started 12 to 24 hours after the last caffeine, reached peak intensity at 20 to 51 hours, and lasted 2 to 9 days in total. These are typical ranges, not a forecast for you: some people feel little, others feel it for longer.

Use your last caffeine, not the moment you decided to quit, as the starting point. If your last coffee was at 3 p.m., the 12–24 hour window runs from 3 a.m. to 3 p.m. the next day, which is why many people first notice withdrawal on the first morning without coffee.

MedlinePlus says withdrawal symptoms usually go away after a couple of days. That fits the short end of the research range; the review shows that a longer course of up to 9 days is still within what is typical.

How much daily caffeine it takes to get withdrawal symptoms

You don’t need a big habit. The review found that stopping doses as low as 100 mg a day produced symptoms, and that symptoms became more frequent or more severe as the usual daily dose went up. The NHS estimates about 100 mg in a mug of instant coffee, and MedlinePlus puts an 8-oz cup of coffee at 95–200 mg, so a one-cup-a-day routine can be enough.

Caffeine also hides in places people forget when they quit. The FDA lists energy and protein bars, ice cream, chewing gum, dietary supplements and over-the-counter medicines as products that may contain added caffeine, and MedlinePlus notes that some pain relievers and cold medicines contain it. Decaf is not caffeine-free either: the FDA says an 8-oz cup typically has 2 to 15 mg. Our caffeine chart and decaf coffee page show where the milligrams come from.

Withdrawal also explains part of why the habit sticks. Juliano and Griffiths concluded that avoiding withdrawal symptoms plays a central role in habitual caffeine use, and some researchers argue that much of the morning boost regular drinkers feel is simply the reversal of overnight withdrawal. That idea is debated; our guide to caffeine tolerance explains both sides.

What helps with caffeine withdrawal, and what has never been tested

The FDA says that if you drink caffeine every day and want to cut back, it is best to do so gradually. MedlinePlus gives the same advice: reduce your intake slowly to prevent withdrawal symptoms.

What nobody has established is how slowly. We found no study that compares taper speeds, so popular schedules such as “cut 10–25% a week” are rules of thumb, not tested plans. The closest trial, by Evatt and colleagues in 2016, gave heavy users (averaging 666 mg a day) one counselling session, a booklet and a 5-week plan of progressively lower intake. They cut their caffeine significantly and showed no significant increase again over a year. That tested a whole package, though, not tapering against stopping abruptly.

If symptoms become too much, some caffeine is likely to ease them, because withdrawal is your body missing the caffeine it is used to. In a trial of regular caffeine users who had gone 16 hours without it, those given a placebo became less alert and reported more headache, while those given caffeine (100 mg, then 150 mg) had their alertness brought back to baseline. Stepping back up to a smaller dose than your old habit and then cutting more slowly is a reasonable choice, not a failure; no study has tested the best size for that step.

• Cut one drink or one size at a time, for example swap your second mug for decaf or half-caf.
• Keep a note of hidden sources (pain relievers, energy drinks, chocolate, supplements) so they don’t undo your plan.
• Avoid starting the cut right before a demanding day: the typical peak falls 20–51 hours after your last caffeine.
• For painkillers or any medicine during withdrawal, ask your doctor or pharmacist, and check whether the product itself contains caffeine.

Is caffeine withdrawal dangerous? When withdrawal symptoms need a doctor

According to the FDA, caffeine withdrawal can be unpleasant but is not considered dangerous. It is a recognized diagnosis in the DSM-5, the diagnostic manual used by mental health professionals. “Caffeine use disorder”, by contrast, is listed only as a condition for further study, so relying on your morning coffee is not, by itself, a diagnosis.

A clinical review in StatPearls warns that withdrawal symptoms such as headache, tiredness, irritability and mood changes can be mistaken for other neurological or psychiatric problems. The reverse is also true: not every headache or low day after quitting is withdrawal. See a doctor if your symptoms are severe, started without any change in your caffeine, keep getting worse after the first few days, or last well beyond 9 days.

Chest pain, fainting, shortness of breath, confusion or a racing or irregular heartbeat are not on the list of withdrawal symptoms. Get urgent medical help for any of them. If you are pregnant or breastfeeding, have migraines or a heart rhythm problem, or take medicines that interact with caffeine, check with your doctor or pharmacist before changing your caffeine.

Common questions