Caffeine Withdrawal Symptoms: 10 Confirmed, 3 Likely
Caffeine Withdrawal Symptoms: 10 Confirmed, 3 Likely
The confirmed caffeine withdrawal symptoms are headache, fatigue, low energy, drowsiness, reduced alertness, low mood, irritability, poor concentration, and a foggy head. Three more, flu-like aches, nausea, and muscle stiffness, are judged likely but lack the same volume of controlled data. About 50% of people who quit get a headache, and 13% have symptoms severe enough to disrupt work or daily function. Symptoms usually start 12 to 24 hours after the last dose and resolve within 2 to 9 days (Juliano & Griffiths 2004).
| Symptom | Evidence status (Juliano & Griffiths 2004) | How often (double-blind data) | DSM-5 group |
|---|---|---|---|
| Headache | Confirmed | 50% in experimental studies; 52% moderate or severe (Silverman 1992) | Headache |
| Fatigue | Confirmed | 8% high fatigue scores (Silverman) | Marked fatigue or drowsiness |
| Decreased energy / activeness | Confirmed | 11% low vigor scores (Silverman) | Marked fatigue or drowsiness |
| Drowsiness | Confirmed | not separately reported | Marked fatigue or drowsiness |
| Decreased alertness | Confirmed | not separately reported | Difficulty concentrating |
| Difficulty concentrating | Confirmed | not separately reported | Difficulty concentrating |
| Foggy / not clearheaded | Confirmed | not separately reported | Difficulty concentrating (grouped here) |
| Depressed mood | Confirmed | 11% abnormally high depression scores (Silverman) | Dysphoric or depressed mood, irritability |
| Decreased contentedness | Confirmed | not separately reported | Dysphoric or depressed mood, irritability |
| Irritability | Confirmed | not separately reported | Dysphoric or depressed mood, irritability |
| Flu-like symptoms | Likely | not separately reported | Flu-like symptoms |
| Nausea / vomiting | Likely | not separately reported | Flu-like symptoms |
| Muscle pain / stiffness | Likely | not separately reported | Flu-like symptoms |
Source: Juliano & Griffiths 2004 review of 57 experimental and 9 survey studies; incidence from Silverman et al. 1992 (n=62, double-blind).
The original review catalogued 49 reported symptom categories across the literature. Of those, 10 met strict validity criteria and 3 more were judged likely. Higher daily caffeine intake predicted more symptoms and greater severity, and abstinence from doses as low as 100 mg/day was enough to trigger them.
How Many Symptoms Make It a Clinical Withdrawal?
The DSM-5 diagnosis requires three or more of five symptom groups within 24 hours of cutting back or stopping caffeine (Meredith et al. 2013). The five groups are:
- Headache
- Marked fatigue or drowsiness
- Dysphoric mood, depressed mood, or irritability
- Difficulty concentrating
- Flu-like symptoms (nausea, vomiting, or muscle pain/stiffness)
Both the ICD-10 and the DSM-5 recognize caffeine withdrawal as a clinical diagnosis. A single bad headache after skipping coffee is common but is not, by itself, enough to meet the formal threshold.
Does Caffeine Withdrawal Cause Nausea or Flu-Like Symptoms?
Flu-like malaise, nausea or vomiting, and muscle pain or stiffness are classified as "likely" withdrawal symptoms, one tier below the 10 fully confirmed categories (Juliano & Griffiths 2004). They were reported often enough to be plausible but lacked the volume of controlled data that headache and fatigue had.
This is why some people who quit caffeine feel like they are coming down with a cold. If you develop an actual fever, though, caffeine withdrawal is not the explanation. Fever does not appear anywhere on the validated list. See a clinician if a fever accompanies your other symptoms.
How Common Is Each Symptom, and Does Withdrawal Affect Mood?
Headache is the most frequent withdrawal symptom by a wide margin. The review puts headache incidence at 50% across experimental studies, and the Silverman trial found 52% experienced moderate or severe headache during the caffeine-free period versus just 2% at baseline (Silverman et al. 1992).
Overall, 13% of participants in the research experienced clinically significant distress or functional impairment. In the same trial, 13% took unauthorized medication during the placebo period, compared to 2% during the caffeine period. Performance also declined: tapping speed slowed on placebo days (P < 0.01).
Depressed mood, decreased contentedness, and irritability are all confirmed withdrawal symptoms. In the Silverman 1992 double-blind trial (n=62, mean intake 235 mg/day), 11% of participants scored abnormally high on the Beck Depression Inventory during the placebo period, compared to 2% at baseline and 3% during the caffeine period. Trait-anxiety scores were elevated in 8% on placebo versus 0% at baseline.
One important distinction: "anxiety" as a standalone category is not among the 10 validated withdrawal symptoms, even though many online lists include it. The data supports depressed mood and irritability, not a generalized anxiety response. For the separate question of whether caffeine itself causes anxiety, see the dose thresholds that matter.
When Does Caffeine Withdrawal Hide Behind Something Else?
Caffeine withdrawal does not always announce itself. Several common situations mask it.
Post-surgery headaches. In a questionnaire study of 287 patients having minor elective surgery, each additional 100 mg of daily caffeine raised the odds of a post-operative headache by 16% and pre-operative headache by 12% (Fennelly et al. 1991). Headache was not linked to the anesthetic used, and the authors put it down at least partly to caffeine withdrawal around the operation. Tell your anesthesia team how much caffeine you normally consume.
Fasting days. Religious fasts, medical prep fasts, and even intermittent fasting windows can overlap with your last caffeine dose by enough hours to start withdrawal. See common fasting headache causes.
Sleeping in on weekends. A Saturday lie-in pushes the first dose later than usual, and a weekend headache can be the result.
Sick days. Skipping coffee because you feel unwell can layer withdrawal symptoms on top of the illness.
What Happens in the Brain During Caffeine Withdrawal?
In a double-blind trial, 16 regular caffeine users were kept on 400 mg/day, then switched to placebo; 24 hours of abstinence increased cerebral blood flow velocity in the middle and anterior cerebral arteries, raised EEG theta power, and lowered beta-2 power (Sigmon et al. 2009). Participants rated themselves higher on tired, fatigued, sluggish, and weary, and lower on energetic, lively, and vigor. For the adenosine-receptor story behind tolerance, see how caffeine tolerance develops.
How Long Do Caffeine Withdrawal Symptoms Last?
Onset is typically 12 to 24 hours after the last dose, peak severity hits between 20 and 51 hours, and most symptoms resolve within 2 to 9 days (Juliano & Griffiths 2004). MedlinePlus puts it more simply: symptoms usually go away after a couple of days. For a detailed day-by-day breakdown, see the caffeine withdrawal timeline, hour by hour, and for headache duration specifically, see how long a caffeine withdrawal headache lasts.
When Are Symptoms Not Caffeine Withdrawal?
Most caffeine withdrawal is uncomfortable, not dangerous. The FDA states that caffeine withdrawal is not considered dangerous but can be unpleasant, and recommends cutting back gradually rather than stopping abruptly.
See a clinician promptly if you experience any of the following, because these are not withdrawal symptoms:
- Fever or stiff neck
- Sudden, worst-ever headache
- Headache with vision changes or one-sided weakness
- Chest pain or shortness of breath
- Symptoms that persist longer than about two weeks
- New depressed mood that does not lift as caffeine clears
How Do You Cut Back Without the Full Set of Symptoms?
The FDA's advice is straightforward: reduce caffeine gradually rather than quitting cold. MedlinePlus notes that withdrawal symptoms usually go away after a couple of days.
One pattern that quietly drives mini-withdrawal cycles: an inconsistent daily dose. Three cups Monday, one on Saturday, none on Sunday. Each dip can cross the threshold. A fixed, countable daily amount sidesteps the rollercoaster. Each Roon pouch delivers exactly 80 mg of caffeine, so tracking your total takes arithmetic, not guesswork. Roon's own cap is four pouches (320 mg), which leaves room inside the FDA's 400 mg daily figure for healthy adults, counting every source (how much caffeine is too much).
Related from Roon
- Caffeine Withdrawal Timeline, Hour by Hour
- Caffeine Withdrawal Headache Timeline
- Caffeine Crash Symptoms and Timeline
Frequently Asked Questions
Can you get withdrawal from just one cup a day?
Yes. The Juliano & Griffiths review found that abstinence from as little as 100 mg/day produced withdrawal symptoms in controlled studies. The Silverman 1992 trial participants averaged only 235 mg/day, about 2.5 cups of coffee, and still showed headache rates above 50%, elevated depression scores, and measurable performance declines. So even a modest daily habit can produce symptoms when it stops.
Is caffeine withdrawal dangerous?
The FDA says caffeine withdrawal is not considered dangerous but can be unpleasant. The red flags listed in the safety section above (fever, sudden severe headache, vision changes, chest pain, symptoms lasting beyond two weeks) warrant a visit to a clinician, because those point to something other than caffeine withdrawal.
Does switching to decaf prevent withdrawal?
Not entirely. Decaf coffee still contains a small amount of caffeine, but far less than regular coffee, so a straight switch is still a big cut in your daily dose. For the actual caffeine content in decaf, see how much caffeine is in decaf coffee.
Why do I feel like I have the flu after quitting caffeine?
Flu-like malaise, nausea, and muscle pain or stiffness form one of the "likely" withdrawal symptom clusters identified in the research. They are common enough to be plausible but not yet as well-documented as headache or fatigue in controlled trials. The key difference: fever is not on the list of withdrawal symptoms. If you have a fever, something else is going on.
A Dose You Can Count Every Day
Withdrawal is the tax on an inconsistent caffeine habit. Big Monday, small Saturday, nothing Sunday, and the cycle restarts. A steady daily dose you can actually track keeps the pattern even.
Every Roon pouch holds the same 80 mg of caffeine, alongside 60 mg L-theanine, 25 mg methylliberine (Dynamine) and 5 mg theacrine (TeaCrine), with zero nicotine. The methylliberine slows caffeine clearance: in a randomized, double-blind crossover study (n=12), co-administration with caffeine extended caffeine's half-life from 7.2 to 15 hours and cut oral clearance from 41.9 to 17.1 L/hr, with no increase in peak concentration (study). That study dosed 100 mg methylliberine with 150 mg caffeine, roughly 4x and 1.9x what a single Roon pouch contains, so the mechanism applies directionally, not as a direct measurement of the product. Each pouch is felt for roughly 6 to 8 hours, with no jitters and no crash. Finish your last pouch eight or more hours before you plan to sleep.
Roon contains caffeine, so stopping it can produce the same withdrawal symptoms described above. It is not a way to quit caffeine. It is a way to keep the dose predictable. Roon starts from $9.16 per tin on a subscription.
Sources
- Juliano LM, Griffiths RR. A critical review of caffeine withdrawal. Psychopharmacology 2004;176:1-29. PubMed
- Silverman K, Evans SM, Strain EC, Griffiths RR. Withdrawal syndrome after the double-blind cessation of caffeine consumption. NEJM 1992;327:1109-14. PubMed
- Meredith SE, Juliano LM, Hughes JR, Griffiths RR. Caffeine use disorder: a comprehensive review and research agenda. J Caffeine Res 2013;3(3):114-130. PMC
- Sigmon SC et al. Caffeine withdrawal, acute effects, tolerance, and absence of net beneficial effects of chronic administration. Psychopharmacology 2009;204:573-85. PubMed
- Fennelly M, Galletly DC, Purdie GI. Is caffeine withdrawal the mechanism of postoperative headache? Anesth Analg 1991;72:449-53. PubMed
- FDA. Spilling the Beans: How Much Caffeine is Too Much? fda.gov
- MedlinePlus. Caffeine. medlineplus.gov
Written by Roon Team
