cannabis induced anxiety disorder

Substance/Medication-Induced Anxiety Disorder

Steven Gans, MD is board-certified in psychiatry and is an active supervisor, teacher, and mentor at Massachusetts General Hospital.

Substance or medication-induced anxiety disorder is the diagnostic name for anxiety or panic attacks that are caused by alcohol, drugs, or medications. While it is normal to have some feelings of anxiety in stressful situations, and even the transient feelings of anxiety or panic that can happen spontaneously during intoxication or withdrawal from alcohol or drugs, substance-induced anxiety disorder causes clinically significant distress or functional impairments.  

Unfortunately, the same drugs that many people use to try and boost their confidence, help them relax, and lower their inhibitions are the ones most prone to causing substance-induced anxiety disorder or panic attacks. In some cases, people don’t even realize that it is alcohol, drugs, or medications that are causing anxiety because they only associate those substances with feeling good.


When your doctor gives a diagnosis of substance/medication-induced anxiety disorder, they check to make sure that the anxiety wasn’t there before the use of alcohol, drugs or medications thought to be responsible.

This is because there are several different types of anxiety disorders, and if the symptoms were there before the substance use, it isn’t diagnosed as substance/medication-induced anxiety.  

When Anxiety Begins After Taking the Drug

In some cases, anxiety or panic can occur straight away. There is even a category “with onset during intoxication,” which means that the anxiety episode actually started when the individual was drunk or high on the drug.   It can also occur during or shortly after withdrawal, during which symptoms of anxiety are common.

However, with anxiety which is simply a symptom of withdrawal, the person’s symptoms will generally resolve within a few days of discontinuing alcohol or drug use, while with substance-induced anxiety disorder, the panic and anxiety symptoms are sufficiently severe to warrant independent clinical attention.

Generally, the diagnosis isn’t given if the person has a history of an anxiety disorder without substance use, or if the symptoms continue for more than a month after the person becomes abstinent from alcohol, drugs, or medication.  

For the diagnosis of Substance/Medication-Induced Anxiety Disorder to be given, the symptoms have to be causing a great deal of emotional upset or significantly affecting the person’s life, including their work or social life, or another part of their life that is important.

Drugs That Cause Substance/Medication-Induced Anxiety Disorder

A wide variety of psychoactive substances can cause substance-induced anxiety, including:

  • Alcohol-induced anxiety disorder  
  • Caffeine-induced anxiety disorder
  • Cannabis-induced anxiety disorder
  • Phencyclidine-induced anxiety disorder
  • Other hallucinogen-induced anxiety disorder
  • Inhalant-induced anxiety disorder
  • Amphetamine-induced anxiety disorder
  • Other stimulant-induced anxiety disorder
  • Cocaine-induced anxiety disorder
  • Other substance-induced anxiety disorder
  • Unknown substance-induced anxiety disorder

Several medications are known to cause substance/medication-induced anxiety including:

  • Anesthetics
  • Analgesics
  • Sympathomimetics
  • Anticholinergics
  • Thyroid medications
  • Antihistamines
  • Antiparkinsonians
  • Corticosteroids
  • Anticonvulsants
  • Mood stabilizers
  • Antipsychotics
  • Antidepressants

Specific heavy metals and toxins that can cause panic or anxiety symptoms include organophosphate insecticide, nerve gases, carbon monoxide, carbon dioxide, and volatile substances such as gasoline and paint.

Learn about substance/medication-induced anxiety disorder, which is anxiety or panic that is caused by alcohol, illicit drugs, or medications.

Marijuana-Induced Anxiety Is Weed Culture’s Bigfoot

You might not remember your first time smoking weed. But you’ll remember the first time smoking weed made you freak the fuck out.

I was at a friend’s house five years ago, curled into a ball after three hits of unequivocally good weed. My brain loomed in and out of consciousness. I was scared. Every few seconds, the room would turn black. I could feel my heart about to burst, and eventually, I succumbed to a comatose-like sleep. It wasn’t like other times, and it sucked.

Marijuana-induced anxiety is weed culture’s Bigfoot—an urban legend that’s perpetuated by hearsay, rather than fact. Everyone knows someone whose friend’s cousin had a bad trip. (“But like, weed is really good for anxiety, right?”). As a result, the truth of the matter is muddled, and discussing reefer madness can actually make you feel insane.

“I puked some indeterminate number of times. Then I basically just lay down on the tile floor. Some part of me was aware, the whole time, that I was just way too high, and it would eventually pass,” one person told me about their experience. “I woke up on the bathroom floor in the morning. I felt extremely bad.”

“My boyfriend and I had tickets to a Kate Nash concert and smoked a joint before heading out,” said another. “I remember feeling kind of floaty on the cab ride over—almost like I wasn’t fully in my body…Then, during the opener, the room started to go dizzy and I suddenly couldn’t see or hear anything. The next thing I remember is waking up on the floor several minutes later, a crowd of people hovering around me, feeling like I’d died.”

“I wasn’t right for the next three days,” one person who developed a later anxiety disorder told me. “My friends still talk about this event and we laugh, but that experience fucked me up and I never smoked weed again. And never will.”

I spoke to dozens of people whose symptoms were mostly the same: anxiety, distorted vision or hearing, dizziness, and blacking out. These aren’t the nice effects of weed, mind you. And as someone with an anxiety disorder, I can tell you they feel a lot like a panic attack.

Thanks in part to stringent marijuana laws, it’s been difficult for researchers to gather data that isn’t only self-reported.

But it’s not clear whether weed jumpstarts anxiety disorders, and the association is tenuous. When existing studies on this topic were reevaluated, and other anxiety stressors were controlled for, an almost insignificant amount of people showed a link between marijuana use and anxiety development. Research based on longitudinal data from a National Epidemiologic Survey on Alcohol and Related Conditions, which included interviews with 34,653 participants, also found negligible evidence that weed can catalyze anxiety.

Still, thanks in part to stringent marijuana laws, it’s been difficult for researchers to gather data that isn’t only self-reported. Things like cannabis strain, for instance, which can determine the type of high that someone gets, are impossible to standardize in large studies.

“It’s not just whether or not a person has a genetic risk factor. It’s really looking at the expression of those genes, and that’s brought on by environmental factors that change the way genes are expressed,” April Thames, an assistant professor at the University of California, Los Angeles’ Department of Psychiatry and Biobehavioral Sciences, told me.

“It’s conceivable that the use of these substances could impact one’s trajectory to develop anxiety, but need there needs to be more research.”

For people who already have anxiety disorders, it’s a little different. Stress and anxiety are brother and sister—controlling one can help the other. A prominent theory suggests that naturally occurring cannabinoids in our brains can be produced in response to stress hormones. These molecules, in turn, may disrupt the amygdala, a region near the base of our brain that contributes to anxious feelings when overstimulated, according to a 2016 study published in the Journal of Neuroscience. It should be noted, however, that this was an animal study, which affects its ability to reliably predict these same results in humans.

Another study, published one year earlier in Neuropsychopharmacology Reviews, also linked cannabinoids, specifically anandamide (AEA) and 2-arachidonoylglycerol (2-AG), to stress responses. It stated that certain cannabinoid receptors interact with these molecules to regulate stress. Based on this research, it’s been theorized that when tetrahydrocannabinol, or THC—the psychoactive compound in weed that gets you high—binds with specific brain receptors, feelings of anxiety can either be increased or decreased. And for some people, smoking weed with higher levels of THC can induce symptoms common with anxiety.

“If someone has a history of anxiety, panic episodes, or even depression, cannabis can exacerbate those effects, according to some literature,” Thames added. “There’s some thought that cannabis has a connection [with making these receptors more sensitive], bringing on an anxiety-like state.”

Different strains of weed can also play a role. Thoughtful sellers often prescribe indica, rather than sativa, to anxiety-prone people. There are shaky genetic differences between modern Cannabis indica and Cannabis sativa, but very broadly, certain types of indica can possess higher cannabidiol (CBD) levels. CBD is a cannabinoid like THC, but is non-psychoactive, resulting in a gentler high. (As with all homeopathic medicine, your method may vary.)

If one thing’s for certain, it’s that weed is still drastically under-researched, and we won’t know if and when weed will give us a panic attack until we surpass regulatory hurdles and embrace the science. Hopefully, as marijuana laws become less draconian, psychologists will have more freedom to study its effects—positive and negative.

Until then, don’t feel down if weed makes you feel bad. Experiment with different strains, and at the end of the day, remember that it’s supposed to make you feel good.

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Ever get the fear when you smoke pot? Scientists are still trying to work out why.