How does cannabis impact concentration and focus?

How can chronic conditions affect concentration and focus?

Chronic, or long-term, health conditions typically refer to persistent conditions that require ongoing treatment. This can include both mental and physical health conditions, which may pose significant disturbance to a person’s daily activities. For example, many chronic conditions are associated with focus and concentration issues that are likely to impact an individual’s professional life, self-esteem, and relationships. 

Some conditions that are commonly linked to deficits in concentration and focus include:

Attention-deficit/hyperactivity disorder (ADHD)

ADHD is a neurodevelopmental condition that can cause issues with concentration and focus, among other behavioural and mood-related symptoms, and time and time again individuals with ADHD report finding it hard to focus. As ADHD symptoms typically begin in childhood, this can cause difficulties with learning and completing academic and work tasks, which may continue into later life. 

Treatment for ADHD can involve multiple approaches, including medication and behavioural therapy. For example, stimulant medications such as Ritalin and Adderall may be prescribed to manage inattention and hyperactivity. 

Post-traumatic stress disorder (PTSD) 

PTSD is a type of anxiety disorder that is usually triggered by a traumatic event or stressful experience. Individuals with PTSD can experience a range of symptoms, including nightmares, flashbacks, and trouble concentrating. These symptoms can significantly interfere with everyday life.

Again, treatment for PTSD often involves therapy. This is typically used to help individuals process trauma and develop coping strategies. In addition, medications such as antidepressants are often prescribed to treat anxiety and depression associated with PTSD.

Anxiety

Anxiety is a normal response to some situations in life. However, in some cases, feelings of anxiety can be disproportionate to the circumstances, triggering mental and physical symptoms. Anxiety disorders are relatively common mental health conditions that can significantly impact various aspects of an individual’s life. For example, for some people, anxiety may impair concentration and focus, in turn affecting their work, domestic, and social, commitments.

Some people with anxiety disorders may benefit from cognitive behavioural therapy (CBT) to help manage their stress and worries, and in some cases, medications such as antidepressants may be considered to improve symptoms. However, unfortunately, these medications have the potential to further contribute to problems with focus and concentration. 

Chronic pain

Chronic pain refers to pain that persists beyond the usually expected recovery period of an injury -  typically for three months or more, but it can also include conditions such as fibromyalgia and arthritis. Chronic pain is also often a co-morbidity to conditions such as anxiety and depression, which can further contribute to a reduced quality of life. Some individuals with chronic pain also report concerns with cognitive function, as their memory and/or concentration is impacted. 

Treating chronic pain usually takes a multidisciplinary approach, combining lifestyle changes, medications, and often cognitive behavioural therapy. Typically, prescribers recommend medications such as non-steroidal anti-inflammatory drugs, opioids, and antidepressants to manage the symptoms of chronic pain.

Medications that can affect concentration and focus

A number of medications - including some that are used as first-line treatments for many chronic conditions - may be associated with a reduction in concentration and focus. This may also be referred to as “brain fog”. 

This may include opioids, which are often used in the treatment of chronic pain, and some antidepressants, which as we previously mentioned, are routinely prescribed for anxiety and depression. Some sleep medications may also be associated with confusion, forgetfulness, and lack of concentration. 

Cannabis for focus and concentration

Chronic conditions can be difficult to treat as there is often no cure. Instead, treatment options focus on effective symptom management; however, some medications prescribed for these conditions may be associated with undesirable side effects that can prompt patients to seek alternative therapies. 

In the UK, medical cannabis can now be considered in circumstances where at least two conventional therapies have been inadequate at managing symptoms or have been associated with intolerable side effects. 

But what is the effect of cannabis on the brain? Could medical cannabis help with concentration and focus, or make things worse?

Let’s take a closer look at how cannabis affects brain function and what this could mean for medical cannabis patients.

THC: Effects on the brain and concentration

Tetrahydrocannabinol (THC) is the main psychoactive compound found in cannabis. It interacts with cannabinoid receptors in the endocannabinoid system which is expressed throughout the body, including in the brain. These interactions have been seen to trigger a wide range of effects. 

For example, some studies indicate that exposure to THC can cause a decline in cognitive function, including decision-making, the formation of memories, and concentration. However, other evidence suggests that, at some doses, THC may actually help to improve focus and concentration.

One study, conducted in 2001 2001 study found that higher doses of THC were associated with improvements in sustained attention. Another study, published in 1999, found that daily cannabis users performed better on a task of divided attention following acute intoxication.

CBD for focus and concentration

Now let's look at cannabidiol, or CBD, which is the second-most abundant cannabinoid found in cannabis. CBD is a compound that has been researched extensively for its therapeutic potential, and a growing body of evidence indicates that CBD may have anxiolytic (anxiety-reducing) and antipsychotic properties. 

Anecdotal reports suggest that the compound may be beneficial for improving focus and concentration; however, more clinical trials are needed to fully understand this potential. On the other hand, previously published studies overwhelmingly indicate that CBD does not impair cognitive function. As one study, published in 2024, concluded: “acute CBD alone is unlikely to significantly impair daily functioning or workplace performance.” 

The importance of a personalised treatment

While research into the cognitive effects of cannabis and its derivatives can be conflicting, it is important to note that these effects can vary significantly based on a number of factors.

Dosage, cannabinoid concentration, and the biology of the individual can all impact the effects of cannabis, which is why it is important to use medical cannabis under the supervision of a medical expert.  

Many medical cannabis patients report that their medication has helped to improve their attention and focus. This was true in the case of Releaf patient, Isabelle, who takes medical cannabis to manage her ADHD symptoms. Isabelle told us:

“It really helps me focus and get the motivation I need to get things done… Instead of this internal battle over what I need to do and where to start, I’m able to have a clearer idea of what needs doing and how to get it done.”

If you’re interested in medical cannabis as an alternative or complementary treatment, our specialist doctors are here to help. You can read more about the conditions we treat, including ADHD, PTSD, chronic pain, and anxiety, on the Releaf website. To find out if medical cannabis could be an option for you, take a look at our free eligibility checker and sign up for a consultation today.