Can Regular Cannabis Use Trigger Anxiety or Psychosis?

Regular cannabis use can cause anxiety in some people, and a PubMed Central review of cannabis and psychosis describes an association between heavy, high-potency use and psychosis, especially when use starts young or psychosis runs in the family. Most people who use cannabis do not develop psychosis. It becomes urgent when someone hears voices, holds fixed false beliefs, or has thoughts of harming themselves or others. This article explains how the link works, what withdrawal can feel like, and when to get help.

Regular cannabis use and anxiety or psychosis: what the evidence shows

Cannabis affects mood, thinking and perception, and the effects differ from person to person. Some people feel relaxed. Others feel racing thoughts, a pounding heart, dread or suspicion. The same person can react differently on different days, depending on the product, the amount and their stress level.

The link between cannabis and mental health is real in the research, but the cause-and-effect picture is not settled. A scoping review of cannabis-related adverse mental health outcomes across adolescence and adulthood, published through the National Library of Medicine's PubMed Central, describes how risks vary by age, how often someone uses and the type of outcome studied. Several factors contribute, and no single explanation covers everyone.

Two different problems are often grouped together, so it helps to separate them:

• Anxiety: worry, panic attacks, restlessness, trouble sleeping, or a sense of dread that may appear during use, between uses or during withdrawal.
• Psychosis: a loss of contact with what is real. It can include hallucinations (hearing or seeing things others do not), delusions (fixed false beliefs, such as being watched or targeted) and very disorganized speech or behavior.

How cannabis may contribute to anxiety

The main psychoactive ingredient in cannabis is THC. In some people, THC can raise heart rate and produce feelings of panic or paranoia, particularly at higher doses. Edibles can take longer to take effect than smoked or vaped products, and some people take more while waiting, which can lead to an unpleasantly strong reaction.

Regular use may also feed a cycle. A person feels anxious, uses cannabis to calm down, feels better for a short time, and then feels more anxious as the effect wears off. Over weeks or months, the anxiety can seem to belong to the person's "normal," when it may be partly linked to the pattern of use. Sleep problems add to this, because poor sleep can worsen anxiety on its own.

Anxiety can also come first. People with an existing anxiety disorder may use cannabis for relief and then find symptoms persist or worsen. Research on this is mixed, and the direction of the relationship can differ between people. If you recognize the cycle, our article on generalized anxiety disorder covers the conditions that can look similar and the treatments clinicians commonly consider.

What makes psychosis more likely with cannabis

A review titled The Role of Cannabis in the Development of Psychosis discusses the evidence that cannabis is associated with psychotic symptoms and psychotic disorders. The pattern described across this research includes several risk features:

• Frequent or daily use over a long period.
• High-THC products, such as concentrates, which can deliver much more THC than older forms of cannabis.
• Starting in the teenage years, when the brain is still developing.
• A family history of schizophrenia or another psychotic disorder.
• Other stressors, such as trauma, sleep loss or use of other substances.

Researchers are still studying how cannabis may influence the brain. A paper on whether cannabis can cause brain changes that raise the risk for schizophrenia reviews proposed mechanisms, and it shows that the science is not fully understood. Cannabis may be one contributing factor among genes, development and life circumstances, rather than a sole cause.

It also helps to keep the scale in view. Most people who use cannabis never have a psychotic episode. A single symptom, such as feeling suspicious after a strong edible, does not establish a psychotic disorder. The concern is a pattern: symptoms that repeat, last, or continue after the effects of the drug should have faded.

The anxiety and psychosis connection

Anxiety and psychosis may be linked to each other as well as to cannabis. A study on relationships between cannabis use, anxiety and depressive symptoms and psychotic experiences supports the idea that low mood and anxiety may be part of one route toward psychotic experiences. For readers, the practical point is that new anxiety, a drop in mood and unusual perceptions deserve attention together, not as separate problems to ignore.

Early warning signs to take seriously

Psychosis often develops gradually. Changes that may appear before a full episode include:

• Pulling away from friends and family or losing interest in usual activities.
• A decline in school or work performance.
• Strong suspicion that others are watching, talking about or plotting against you.
• Hearing a voice, whisper or sound that no one else hears.
• Thoughts that feel jumbled, or speech that others struggle to follow.
• Sleep that is badly disrupted for days.
• Odd or intense beliefs, such as feeling that certain events carry special messages meant for you.

These signs can also occur with other conditions, including mood disorders, severe sleep loss and other drug use, so a clinician needs to look at the whole picture. Our article on the early signs of schizophrenia describes this group of symptoms in more detail. This page focuses on the cannabis angle.

Intoxication, withdrawal and lasting symptoms

Clinicians often try to work out when symptoms occur, because the timing guides the diagnosis.

During or soon after use

Anxiety, panic and paranoia can appear while a person is intoxicated. Often these fade as the effects wear off, although they can be frightening. Hallucinations or delusions during intoxication are a reason to be evaluated, particularly if they last longer than expected or return.

During withdrawal

People who use cannabis regularly can have withdrawal symptoms when they cut back or stop. These may include irritability, anxiety, restlessness, low mood and trouble sleeping. A systematic review and case series on psychosis associated with cannabis withdrawal reports that psychotic symptoms have been described in some people during withdrawal, although this is less often reported than the more usual anxiety and sleep problems. Because withdrawal can feel unpleasant, some people go back to cannabis to feel better. If you want to cut back, tell your clinician about your pattern so they can help you plan a safe approach.

Symptoms that persist

For some people, psychotic symptoms ease after they stop using cannabis. For others, symptoms continue or return, and a clinician may consider whether an underlying psychotic disorder is present. Research comparing patients with psychotic disorders who do and do not use cannabis, such as this paper on the neurobiology of cannabis use in psychotic disorders, shows how complex the picture is. Clinicians combine history, examination and sometimes testing to decide what is going on. No single test settles it.

What to do if you are worried about yourself

These steps can help while you arrange an evaluation:

• Keep a simple log of when you use cannabis, what product and how much, alongside when anxiety, sleep problems or unusual experiences occur. Patterns often show up on paper before they feel obvious.
• Be honest with your clinician about frequency, product type and any use of alcohol or other drugs. Clinicians ask so they can help, and the information shapes the advice they give. If alcohol is part of the picture, see our article on signs of alcohol use disorder.
• Mention family history of psychosis, bipolar disorder or schizophrenia, since it may change how your clinician weighs the risks.
• Discuss any medicines you take. If you take a prescription for anxiety, depression or another condition, ask your prescriber how cannabis may interact with it. Do not change or skip a dose on your own.
• Ask about support for cutting back if you have found it hard to stop. Counseling and other treatments exist, and your clinician can discuss which may suit you.

If you are worried about someone else

Someone who is developing psychosis may not recognize it. Arguing about whether their beliefs are true usually does not help. It is often better to stay calm, speak simply, express concern for how they are feeling and encourage a medical visit. Do not leave someone alone if they seem confused, frightened or at risk of harming themselves. If they are in immediate danger or planning to hurt someone, call 911.

Pregnancy and breastfeeding

If you are pregnant or planning pregnancy, tell your obstetric clinician about any cannabis use. MedlinePlus explains substance use during pregnancy on its page Pregnancy and Substance Use. Your clinician can discuss the risks and help you find support if you want to stop.

What treatment can look like

Treatment depends on what is found. If anxiety is the main issue, options clinicians commonly consider include talk therapy such as cognitive behavioral therapy, certain medicines and help with sleep. If a psychotic disorder is suspected, evaluation by a mental health professional is important, and treatment may include medicine and structured support. Reducing or stopping cannabis is often part of the plan, and a clinician can help you do that in a way that fits your situation. Outcomes vary, and early care is often associated with better results.

When to Seek Medical Care