Discover the most common psoriasis triggers, from stress and diet to infections, and learn practical ways to reduce flare-ups.
Hebra Editorial Team
Hebra Journal
Living with psoriasis means navigating a condition that can be unpredictable, frustrating, and deeply personal. One of the most important things you can do for your skin health is to understand your psoriasis triggers — the factors that cause flare-ups or make existing symptoms worse. Psoriasis affects around 2–3% of the UK population, roughly 1.8 million people, yet many go years without proper support or diagnosis. Identifying and managing your triggers won't cure psoriasis, but it can meaningfully reduce the frequency and severity of flare-ups.
Psoriasis is an immune-mediated condition, meaning the immune system mistakenly attacks healthy skin cells, causing rapid cell turnover and the characteristic patches of red, scaly skin. While the underlying cause is genetic and immune-related, a range of external factors — known as triggers — can set off or worsen a flare.
A landmark UK patient-reported study (the mySkin cohort, published in the British Journal of Dermatology) found that the most common triggers for a new episode of psoriasis were:
When it came to worsening of existing psoriasis, the picture was even more pronounced: stress was cited by 94.8% of participants, climate changes by 67.2%, and low mood by 34.6%. These findings reinforce something many people with psoriasis already sense — this condition is deeply connected to both physical and emotional wellbeing.
Stress is consistently the number one psoriasis trigger, and the relationship runs both ways. Stress can spark a flare, and a flare can cause more stress — creating a difficult cycle that's hard to break.
When you're stressed, your body releases inflammatory chemicals that can dysregulate the immune system. For people with psoriasis, this immune disruption can be enough to cause the skin to flare. Psychological stress, low mood, anxiety, and sleep disturbances are all associated with worsening psoriasis severity.
Practical strategies to address stress-related psoriasis triggers include:
While no single food causes psoriasis, research increasingly shows that diet and lifestyle choices can influence how often and how severely flares occur.
A large study using the UK Biobank cohort found that people with a "poor" lifestyle profile — defined as a BMI over 30, active smoking, low physical activity, and poor dietary habits — had a significantly higher risk of developing psoriasis. In those with lower genetic susceptibility, a poor lifestyle was associated with a hazard ratio of 2.32 for incident psoriasis.
Separate studies have found that people with psoriasis tend to consume more red and processed meat, sodium, free sugars, and alcohol compared to those without the condition. These foods can promote systemic inflammation, which is thought to worsen immune dysregulation in psoriasis.
On the flip side, emerging evidence supports the value of:
Beyond lifestyle factors, a number of external and medical triggers can provoke psoriasis flare-ups:
Infections: Streptococcal throat infections (strep throat) are a classic trigger, particularly for guttate psoriasis — the kind that appears as small, droplet-shaped patches across the trunk. Other infections, including respiratory illnesses, can also stimulate the immune system in ways that trigger a flare.
Skin injury (Koebner phenomenon): In some people with psoriasis, injury to the skin — including cuts, burns, insect bites, sunburn, or even friction from clothing — can trigger new plaques at the site of injury. This is known as the Koebner phenomenon and affects a significant proportion of people with psoriasis.
Certain medications: Beta-blockers (used for high blood pressure and heart conditions), lithium, and some antimalarials are known to worsen psoriasis or trigger new flares. If you're starting a new medication and notice a change in your skin, it's worth discussing this with a healthcare professional.
Cold weather and climate: The mySkin study found climate changes — particularly cold, dry weather — were among the most commonly reported factors worsening psoriasis. Winter months often mean less sunlight (UV light has an immunomodulatory effect that can help calm psoriasis) and drier air that irritates skin.
Understanding your triggers is an important part of managing psoriasis, but it's not the full picture. Psoriasis is a systemic condition linked to a higher risk of psoriatic arthritis, cardiovascular disease, and depression. It deserves proper clinical assessment and, where appropriate, targeted treatment.
Unfortunately, access to dermatology in the UK remains challenging. NHS dermatology waiting times can stretch from weeks to months — and in some cases, years — meaning many people are left managing their symptoms without specialist support.
This is where Hebra comes in.
Hebra is a skin health triage app that uses advanced technology to analyse your skin condition and connect you directly with a qualified dermatologist — cutting through the waiting list frustration. Whether you're trying to identify your psoriasis triggers, understand whether your symptoms need treatment escalation, or simply get expert eyes on your skin faster, Hebra provides a faster, more direct path to specialist care.
Ready to get answers sooner? Visit www.hebra.health to get started.
Psoriasis triggers vary from person to person, but stress, diet, infections, and skin injury are consistently among the most significant. Learning to identify your personal triggers — and making adjustments where you can — can make a meaningful difference to your quality of life.
But you don't have to figure this out alone. Psoriasis is a complex, chronic condition that benefits from expert guidance. Don't wait months for answers that could change how you manage your skin — explore what Hebra can do for you at www.hebra.health.
Continue reading
Contact dermatitis causes itchy, red skin from allergens or irritants. Learn the symptoms, common triggers, and how to get the right treatment fast.
Fungal skin infections affect 1 in 5 people worldwide. Learn the types, symptoms, and treatments, plus when to see a dermatologist fast.
Struggling with acne? Explore the best acne treatment options in the UK for 2026, from NHS pathways to new therapies and how to skip the wait.
