Stress is often described as something we feel emotionally, yet for many patients living with chronic conditions it is experienced far more physically, shaping sleep patterns, pain sensitivity and the body’s ability to recover. During periods of heightened stress, patients frequently report that symptoms feel more intrusive, less predictable and harder to manage, even when their treatment has not changed.

This raises a practical question that is not often addressed clearly enough: why does the same treatment sometimes feel effective one week, and noticeably less so the next?

As part of Stress Awareness Month, this shift in treatment experience is worth exploring, particularly in the context of medical cannabis, where patients are increasingly being introduced to the role of terpenes alongside cannabinoids such as THC and CBD.

Stress does not just affect symptoms, it can affect response

When the body is under stress, it activates a physiological response involving the release of hormones such as cortisol and adrenaline. While this response is designed to be protective in the short term, prolonged activation can begin to affect multiple systems at once, including sleep regulation, immune response and pain processing.

The NHS notes that ongoing stress can contribute to sleep disruption, muscle tension, difficulty concentrating and increased sensitivity to discomfort, all of which can compound existing health conditions rather than sit separately from them.

From a patient perspective, this means stress is not simply something that co-exists with a condition, but something that can actively shape how that condition is experienced day to day.

Research also suggests that chronic stress can influence central nervous system activity and inflammatory pathways, both of which are relevant to conditions commonly treated with medical cannabis, including chronic pain and anxiety-related disorders.

Why treatments can feel inconsistent during periods of stress

Patients often describe a loss of consistency during more stressful periods, where a treatment that previously supported sleep or symptom control begins to feel less reliable.

This is not necessarily because the treatment has stopped working, but because the body’s baseline has shifted.

Sleep may become lighter and more fragmented, reducing recovery. Pain thresholds may lower, meaning discomfort feels more intense. The nervous system may become more reactive, increasing restlessness or sensitivity. These overlapping changes can alter how any treatment is perceived, including medical cannabis.

Within cannabis-based medicine, this variability is particularly relevant because response is influenced by more than just cannabinoid content. A 2021 review published in Frontiers in Psychiatry highlights that individual response to cannabis-based products can vary significantly depending on dose, cannabinoid ratio, route of administration and patient-specific factors, including mental state and context.

In simple terms, stress can change the conditions under which a treatment is experienced.

Where terpenes fit into the picture

Terpenes are naturally occurring compounds found in many plants, including cannabis, and are responsible for the distinct aromas associated with different plant species, from lavender to citrus fruits. In cannabis, they are increasingly discussed as part of the plant’s broader chemical profile, sometimes referred to within the context of the “entourage effect”.

A 2020 review in Frontiers in Plant Science describes how cannabinoids and terpenes may interact in complex ways, potentially contributing to the overall pharmacological effect of cannabis-based products, although it also emphasises that human evidence remains limited and further clinical research is needed.

For patients, the most useful way to understand terpenes is not as isolated treatments, but as one factor among many that may influence how a product feels in practice. This includes aspects such as perceived relaxation, alertness or physical ease, although these responses are highly individual and not guaranteed.

Stress, sensitivity and terpene profiles

When stress levels are elevated, patients may find that their sensitivity to certain effects changes. This is particularly relevant when considering THC, which has been shown to have both anxiolytic and anxiogenic effects depending on dose and individual susceptibility.

In this context, terpene profiles may become more noticeable, not because they override cannabinoids, but because they contribute to the overall experience of the product.

For example, terpenes such as linalool and myrcene are often discussed in relation to more physically relaxing or evening-leaning effects, while limonene is sometimes associated with more uplifting profiles. However, these associations are largely based on preclinical or indirect evidence, and should not be interpreted as predictable outcomes.

A review of medicinal cannabis for anxiety disorders, highlights that while certain terpenes show potential relevance, findings remain inconsistent and dependent on preparation, dose and patient context.

For patients, this reinforces the idea that terpene profiles may help explain differences in experience, but should not be relied upon as standalone solutions.

Why “stronger” is not always more effective

One of the more persistent misconceptions surrounding medical cannabis is that higher THC content will automatically lead to better results. In reality, the relationship is more complex.

Higher THC doses have been associated with increased anxiety and adverse psychological effects in some individuals, particularly those who are already experiencing stress or anxiety symptoms.

This is why specialist prescribing is essential. Clinicians consider not only cannabinoid content, but also patient history, symptom profile, mental health considerations and lifestyle factors when developing a treatment plan.

Terpenes, in this context, form part of a broader conversation about tolerability and consistency, rather than potency.

A more patient-focused way to think about stress relief

For many patients, stress relief is not experienced as a sudden sense of calm, but as a gradual improvement in daily function.

Stress does not operate separately from chronic illness or treatment; it interacts with both, shaping how symptoms are experienced and how therapies are perceived.

In medical cannabis, this interaction is particularly visible because treatment effects are influenced by a combination of cannabinoids, terpenes and individual patient factors.

Terpenes are not a cure for stress, nor are they a shortcut to predictable outcomes. However, they may help explain why treatments feel different at different times, especially when the body is under pressure.

For patients, understanding this can support more informed conversations with clinicians and a more realistic expectation of what effective treatment looks like, not a single moment of relief, but a steadier, more manageable day-to-day experience.