Quitting cannabis after regular use can cause a noticeable uptick in heart rate and blood pressure, and many people experience this as heart palpitations. In a controlled study of daily cannabis users, morning heart rate rose from an average of about 75 beats per minute during active use to roughly 81 bpm during abstinence. That increase is modest in absolute terms, but the sensation it produces, especially when combined with the anxiety, insomnia, and general restlessness that accompany withdrawal, can feel alarming. The phenomenon is real, measurable, and well-documented, though the science suggests it is rarely dangerous on its own.
What the Research Shows About Heart Rate During Withdrawal
The most direct evidence comes from a residential laboratory study that monitored heavy cannabis users around the clock during periods of active smoking and then during abstinence. When researchers looked specifically at morning heart rate measurements, taken before any cannabis had been consumed that day, they found a statistically significant increase during withdrawal. Heart rate went from an average of about 75 bpm while participants were still using cannabis to about 81 bpm once they stopped.1PubMed Central. Increased Blood Pressure Following Abrupt Cessation of Daily Cannabis Use The researchers were careful to separate this from the acute effects of being high, which also speed the heart up. The morning-only analysis stripped away the confounding spike that cannabis intoxication itself produces.
An increase of about six beats per minute is not something a doctor would typically call clinically significant in isolation. But “clinically significant” and “something you can feel” are two different things. If you are already anxious, sleeping poorly, and hyper-aware of your body because you are going through withdrawal, even a slight uptick in resting heart rate can register as a fluttering, pounding, or racing sensation in your chest. That is essentially what a palpitation is: a subjective awareness of your own heartbeat, often triggered by a change in rate or rhythm that your brain flags as unusual.
Why Your Heart Reacts When You Stop
Cannabis has a two-phase effect on the cardiovascular system that depends on dose. At low to moderate doses, it activates the sympathetic nervous system, the body’s “fight or flight” branch, leading to a faster heart rate, increased cardiac output, and a bump in blood pressure. At higher doses, the opposite branch, the parasympathetic system, can take over, slowing the heart and dropping blood pressure.2Oxford Academic (European Heart Journal – Case Reports). Cannabis induced cardiac arrhythmias: a case series Regular users develop a degree of tolerance to these effects, so over time their cardiovascular system adjusts to the presence of cannabinoids.
When you abruptly stop, that adaptation doesn’t vanish overnight. The body overshoots in the opposite direction as it recalibrates. If your cardiovascular system had been adjusting to the depressant effects of higher-dose cannabis on blood pressure and heart rate, withdrawal can produce a rebound where both rise. This is the same general principle behind withdrawal effects from alcohol, benzodiazepines, and other substances that depress central nervous system activity: the system that was being pushed down springs back up when the substance disappears.
Blood Pressure Climbs Too
Heart rate is only part of the picture. The same laboratory study found that blood pressure increased markedly during abstinence. Systolic blood pressure (the top number) rose from about 130 mmHg to roughly 140 mmHg, and diastolic (the bottom number) went from about 75 to about 82 mmHg.1PubMed Central. Increased Blood Pressure Following Abrupt Cessation of Daily Cannabis Use That systolic jump of ten points is meaningful. Going from 130 to 140 crosses the threshold that most guidelines consider the start of hypertension.
A simultaneous rise in heart rate and blood pressure can intensify the subjective feeling of palpitations. When the heart is pumping harder and faster against higher vascular resistance, you are more likely to feel each beat, especially in the chest, neck, or temples. Many people describe the experience not as a racing heart per se, but as a forceful “thudding” sensation. If you are lying in bed trying to sleep during the first few nights of quitting, that combination becomes hard to ignore.
How Anxiety Amplifies the Sensation
Cannabis withdrawal is well known for producing anxiety, irritability, and restlessness. These psychological symptoms ramp up your sympathetic nervous system independently of whatever rebound cardiovascular effect is already occurring. In other words, even if the direct heart-rate increase from withdrawal is only a handful of beats per minute, the anxiety layered on top of it can push the rate higher and make you hyper-focused on every heartbeat.
There is a feedback loop at work. You notice your heart beating faster, which makes you more anxious, which speeds your heart up further, which makes you notice it even more. People who have never had a panic attack in their lives sometimes have their first one during cannabis withdrawal, and the pounding heart is usually the symptom that sends them to the emergency room. Emergency physicians are very familiar with this pattern; once serious cardiac causes are ruled out, the reassurance itself often helps the heart rate come back down.
The research team behind the blood pressure study noted explicitly that the five-to-six bpm heart rate increase they observed during withdrawal was unlikely to represent clinically relevant cardiovascular risk on its own.1PubMed Central. Increased Blood Pressure Following Abrupt Cessation of Daily Cannabis Use That is worth keeping in mind if you are going through it: the sensation is disproportionate to the actual danger in most cases.
Cannabis Use Itself Causes Palpitations
Before blaming everything on withdrawal, it helps to know that cannabis use also causes palpitations, and at higher rates than many users realize. Epidemiological data point to high rates of palpitations among cannabis users, driven by dose-related sinus tachycardia, a fancy way of saying the heart speeds up because of how cannabis stimulates the autonomic nervous system.2Oxford Academic (European Heart Journal – Case Reports). Cannabis induced cardiac arrhythmias: a case series The proarrhythmic effect of cannabis begins within minutes of smoking, peaks around half an hour later, and can linger for over 90 minutes.
This matters because some people who feel palpitations early in withdrawal may actually be experiencing carryover effects from their last use session, not withdrawal effects yet. The timeline overlaps in a confusing way: the acute cardiovascular effects of smoking cannabis can last up to a couple of hours, while true withdrawal symptoms typically begin within 24 to 72 hours of the last use and peak somewhere around the end of the first week. If you feel your heart racing four hours after your last joint, that is more likely the tail end of acute intoxication than the onset of withdrawal.
The Diagnostic Picture of Cannabis Withdrawal
Heart palpitations are not listed as a core criterion of cannabis withdrawal syndrome in most diagnostic frameworks. The diagnostic proposals that informed the current guidelines focus on symptoms like irritability, anxiety, sleep difficulty, decreased appetite, depressed mood, physical discomfort, and restlessness.3PubMed Central. Diagnostic Criteria for Cannabis Withdrawal Syndrome The cardiovascular effects, specifically the increases in heart rate and blood pressure, have been documented in research studies but have not been elevated to the same diagnostic status as the psychological and gastrointestinal symptoms.
That does not mean the cardiovascular changes are imaginary or unimportant. It means they tend to be less prominent and less consistently reported than the mood and sleep symptoms. In the same studies that carefully documented heart rate and blood pressure changes, the researchers had to use controlled laboratory conditions and morning-only measurements to tease out the withdrawal effect on heart rate. If it required that level of precision to detect statistically, it is probably subtle enough that many people quitting cannabis never notice it at all. Others notice it intensely, especially those who are already prone to anxiety or who are paying close attention to their physical symptoms.
Nicotine and Other Confounders
Many cannabis users also smoke tobacco or use nicotine, and nicotine has its own well-documented effect on heart rate and blood pressure. One study that examined whether recent cannabis exposure changes the cardiovascular response to nicotine found that it does not: nicotine raised heart rate by roughly nine beats per minute and systolic blood pressure by about 14 mmHg regardless of whether participants had recently used cannabis.4Oxford Academic. Recent cannabis exposure and acute nicotine effects: insights from randomized, double-blind, placebo-controlled intravenous nicotine studies The cardiovascular effects of the two substances did not interact in any significant way.
The practical takeaway is that if you are quitting cannabis and still using nicotine, or quitting both at the same time, the cardiovascular changes can stack. A person going through cannabis withdrawal who also drinks several cups of coffee in the morning and vapes nicotine throughout the day is loading up on stimulants that all independently raise heart rate and blood pressure. Teasing apart which substance is causing your palpitations gets much harder in that scenario. If you are concerned about heart symptoms during a quit attempt, reducing caffeine and nicotine intake at the same time can help you isolate what is actually happening.
Women May Experience Withdrawal Differently
Research on sex differences in cannabis withdrawal has found that women tend to report more intense withdrawal symptoms overall. In a study of treatment-seeking cannabis users, women scored significantly higher on a composite withdrawal symptom scale than men, reporting an average of about eight symptoms compared to roughly six for men.5PubMed Central. Sex differences in cannabis withdrawal symptoms among treatment-seeking cannabis users The differences were most pronounced in two domains: mood symptoms like irritability and restlessness, and gastrointestinal symptoms like nausea and stomach pain.
The study did not specifically single out cardiovascular symptoms, but the higher burden of irritability and restlessness in women is relevant to palpitations. More intense anxiety and agitation will push sympathetic nervous system activation higher, which in turn makes heart-rate increases more noticeable and subjectively distressing. If you are a woman going through cannabis withdrawal and feel like your heart symptoms are worse than what the typical descriptions suggest, you are not imagining it. The overall withdrawal experience appears to be more severe in women on several fronts, and the cardiovascular system does not exist in isolation from the rest of the body’s stress response.
When Palpitations Warrant Medical Attention
Most palpitations during cannabis withdrawal are uncomfortable but not dangerous. They reflect a temporary autonomic rebound that will settle down as your body recalibrates, usually within one to three weeks. But certain features should prompt a visit to a doctor rather than a wait-and-see approach:
- Sustained fast rate: A resting heart rate consistently over 100 bpm, especially if it does not come down with slow breathing or lying still, goes beyond typical withdrawal territory.
- Irregular rhythm: A heart that skips beats, pauses, or feels chaotically irregular, as opposed to simply fast, could indicate an arrhythmia that needs evaluation.
- Chest pain or pressure: Palpitations accompanied by tightness, squeezing, or pain in the chest, jaw, or left arm are cardiac red flags regardless of what is causing them.
- Dizziness or fainting: Feeling lightheaded or actually passing out alongside a racing heart suggests your blood pressure or cardiac output may be dropping, not rising.
- Pre-existing heart conditions: If you have a known arrhythmia, structural heart disease, or are on medications that affect heart rhythm, the relatively modest cardiovascular changes of withdrawal could be more consequential for you than for someone with a healthy heart.
The blood pressure increases documented during withdrawal, with systolic readings climbing into the 140 range on average, are also worth flagging to a doctor if you already have borderline or diagnosed hypertension.1PubMed Central. Increased Blood Pressure Following Abrupt Cessation of Daily Cannabis Use A temporary spike on top of an already elevated baseline could push numbers into ranges that increase the short-term risk of headache, nosebleeds, or in extreme cases, more serious events.
Managing Cardiovascular Symptoms During a Quit
There is no medication specifically approved for cannabis withdrawal, and the cardiovascular symptoms are generally too mild to justify pharmacological treatment on their own. What helps most is addressing the broader withdrawal syndrome, because reducing anxiety and improving sleep will indirectly calm the heart rate changes as well. A few practical strategies that can make a difference:
Controlled breathing exercises work surprisingly well for the acute panicky moments when you feel your heart pounding. Slow exhales activate the parasympathetic nervous system and can bring heart rate down within minutes. This is not a platitude; it is basic physiology, and it is one of the few things that acts fast enough to help when palpitations hit at two in the morning.
Physical activity during the day, even a moderate walk, gives your cardiovascular system something constructive to do and tends to improve sleep quality, which is one of the most disruptive parts of cannabis withdrawal. Exercise will raise your heart rate temporarily, of course, but the post-exercise recovery period often leaves resting heart rate lower than it was before.
Cutting back on caffeine is worth repeating because it is the single most overlooked factor. Many people who quit cannabis lean harder on coffee or energy drinks to compensate for the fatigue and brain fog of withdrawal. Caffeine is a stimulant that raises heart rate and blood pressure independently, and during a period when your body is already running a little hot, stacking more stimulants on top is one of the fastest routes to noticeable palpitations.
Cannabis-Induced Arrhythmias Versus Withdrawal Palpitations
It is worth distinguishing between two different cardiovascular concerns that get conflated in online discussions. Cannabis-induced arrhythmias are rhythm disturbances that occur during or shortly after cannabis use, typically within the first 90 minutes of smoking.2Oxford Academic (European Heart Journal – Case Reports). Cannabis induced cardiac arrhythmias: a case series These have been documented in case reports and include atrial fibrillation, supraventricular tachycardia, and other abnormal rhythms. They are driven by the acute pharmacological effects of THC on the autonomic nervous system and can occasionally be serious.
Withdrawal palpitations, by contrast, are almost always simple sinus tachycardia, meaning the heart is beating faster than usual but in a normal rhythm. The mechanism is autonomic rebound rather than a direct drug effect. The distinction matters because true arrhythmias during cannabis use can sometimes indicate underlying heart vulnerability, whereas the faster-but-regular heartbeat of withdrawal is a predictable physiological response that resolves on its own. If you have experienced arrhythmias while actively using cannabis, that history is relevant to your withdrawal period and should be shared with a physician, because it suggests your heart may respond more dramatically to autonomic swings in either direction.
How Long the Cardiovascular Changes Last
Most cannabis withdrawal symptoms peak within the first week and resolve within two to three weeks for the majority of users. The cardiovascular data from controlled studies aligns with this timeline: heart rate and blood pressure elevations were most prominent during the initial days of abstinence. The body’s autonomic nervous system is remarkably good at finding a new equilibrium once the substance it had been adapting to is removed. For most people, palpitations are an early-withdrawal phenomenon that fades as the other symptoms, particularly anxiety and sleep disruption, begin to improve.
Heavy, long-term users may experience a longer tail of symptoms, sometimes referred to as protracted withdrawal. Whether cardiovascular changes persist in this population has not been studied as carefully as the psychological symptoms, but the mechanism predicts they would not. The autonomic rebound is driven by sudden removal of a substance the body was compensating for; once compensation is no longer needed, there is no ongoing driver for elevated heart rate or blood pressure. If palpitations persist well beyond the first month of abstinence, something else is probably going on, whether that is an anxiety disorder that was being masked by cannabis use, excessive caffeine intake, or an unrelated cardiac issue that warrants its own workup.