Dizzy after coffee? Why caffeine can make you lightheaded

Key takeaways

• MedlinePlus lists dizziness among the effects of too much caffeine and among the symptoms of caffeine overdose.
• Dizziness with breathing trouble or confusion, or with palpitations that do not go away or that come with chest pain, shortness of breath or fainting, needs emergency care.
• NHS self-care for dizziness: lie down until it passes, get up slowly, drink plenty of fluids and avoid coffee.
• Dizziness has many causes besides caffeine, so if it keeps coming back, see a GP or doctor.

When dizziness after coffee needs emergency help

Check for these first. The NHS says to call 999 (or your local emergency number) if you have heart palpitations that do not go away, or palpitations with chest pain, shortness of breath, or feeling faint or fainting. MedlinePlus lists dizziness among the symptoms of caffeine overdose, together with breathing trouble, confusion, seizures, an irregular or rapid heartbeat, vomiting and fever, and says to seek medical help right away.

In the US, call 911 or the national Poison Help line on 1-800-222-1222, which MedlinePlus describes as free, confidential and open 24 hours a day. If you are not sure whether it is serious, get help rather than waiting. Our page on too much caffeine symptoms lists the warning signs in full.

• Heart palpitations that do not go away
• Palpitations with chest pain, shortness of breath, or feeling faint or fainting
• Breathing trouble
• Confusion, hallucinations or a seizure
• A racing or irregular heartbeat that does not settle
• Vomiting

Why coffee can make you feel dizzy or lightheaded

MedlinePlus lists dizziness among the effects of too much caffeine, along with restlessness and shakiness, headaches, a fast heart rate, dehydration and anxiety. It explains that caffeine stimulates the central nervous system and raises blood pressure. The FDA’s list of signs of too much caffeine also includes a faster heart rate, palpitations, anxiety and jitters. Neither agency explains exactly why caffeine causes dizziness, and we won’t guess at a mechanism.

Coffee is not always the cause. The NHS lists many possible causes of dizziness, including stress or anxiety, a sudden drop in blood pressure when you stand or sit up, dehydration, migraine, inner-ear problems, low blood sugar in diabetes and side effects of new medicines. If the dizziness happened on a day you had your usual coffee and nothing more, another cause is worth considering. If coffee leaves you anxious as well as dizzy, see why coffee makes you anxious.

What to do right now if coffee made you dizzy

If none of the emergency signs apply, the NHS advice for dizziness is practical: lie down until the dizziness passes, then get up slowly; drink plenty of fluids, especially water; avoid coffee, cigarettes, alcohol and drugs; don’t bend down or get up quickly; and don’t drive or use machinery while you feel dizzy.

Don’t have more caffeine for the rest of the day. MedlinePlus says caffeine peaks in the blood within an hour and that you may feel its effects for four to six hours. If you are also shaky or wired, our guide on how to stop caffeine jitters has more steps.

How to stop coffee making you dizzy

Look at the dose first. The FDA gives 113 to 247 mg for 12 ounces of brewed coffee, and the same coffee from the same shop measured 259 to 564 mg on different days in one lab study, so a bigger or stronger cup than usual is one possible reason for symptoms. The FDA also says people vary widely in how sensitive they are to caffeine, so your comfortable amount may be lower than other people’s.

MedlinePlus advises some people to check with a health care provider about limiting caffeine, including people with anxiety, an abnormal heart rhythm, high blood pressure, or who take certain medicines such as stimulants, some antibiotics, and asthma or heart medicines. Ask your doctor or pharmacist about your medicines. The NHS says to see a GP if dizziness won’t go away or keeps coming back, or comes with fainting, changes to your pulse, numbness, weakness or vision changes. For a fast heartbeat with coffee, read caffeine and a racing heart.

Common questions