Psoriasis, a chronic skin condition characterized by unbearably itchy skin and angry red patches, now affects nearly 2 million people in the UK, with figures indicating a significant rise of nearly ten per cent in the past decade. Despite its growing prevalence, public understanding of psoriasis remains limited, often leading to misconceptions, such as the belief that it is contagious. This lack of awareness takes a substantial mental toll on sufferers; a significant 40 per cent admit to avoiding dating, social events, or even simple handshakes due to anxiety about visible skin patches. A 2024 survey further highlights this societal discomfort, revealing that over half the population would feel uncomfortable dating someone with psoriasis, and more than a third would hesitate to shake hands or share a meal with a sufferer.

Beyond its visible symptoms, psoriasis can lead to other serious health complications. Approximately a third of patients will eventually develop psoriatic arthritis, a painful inflammatory joint condition. Reality TV star Kim Kardashian famously revealed her diagnosis, describing severe pain that hindered basic tasks. Similarly, Michael Gambon's impactful portrayal of The Singing Detective in the mid-1980s brought psoriatic arthropathy to public attention. Psoriasis patients also face a nearly 50 per cent higher risk of suffering a heart attack or stroke, as the inflammation triggered by the disease can damage blood vessels over time. Despite these severe impacts, research indicates that the NHS frequently fails to effectively treat psoriasis, with some patients enduring waits of up to 15 years for a diagnosis.

Even when patients receive care, treatment often proves inadequate. Dr Ellie Cannon, The Mail on Sunday's resident GP columnist, has expressed concerns about the Health Service's inability to provide the right drugs. Numerous patient testimonies underscore this issue: an 85-year-old, whose scaly patches first appeared in 2000 and spread extensively, has never been offered prescription drugs on the NHS. A 79-year-old, who developed psoriasis in his teens and whose body is now covered in patches, has similarly never found an effective treatment. Furthermore, a 69-year-old woman suffering from scalp and elbow psoriasis reported that GP-provided creams only exacerbated her condition.

Psoriasis is fundamentally triggered by an overactive immune system, which sends inflammation signals that cause skin cells to grow too rapidly, resulting in the characteristic red, scaly, and often itchy patches that may bleed when scratched. While a genetic predisposition plays a role, experts like Prof Christopher Griffiths, a leading dermatologist at King's College London, emphasize that most cases are 'triggered' by specific factors. Studies suggest age is a key trigger, as the immune system becomes increasingly dysfunctional later in life, raising the risk of autoimmune conditions. Certain medications commonly prescribed to older patients, such as blood pressure tablets, have also been shown to increase risk, potentially explaining the rise in cases and the fact that psoriasis patients are living longer.

Beyond age, other triggers include bacterial infections like Strep A, particularly if contracted early in life, making individuals seven times more likely to develop psoriasis. However, lifestyle factors emerge as the most common triggers, offering a crucial avenue for prevention and severity reduction. Exposure to sunlight is a strong indicator, with people in the upper northern hemisphere (e.g., Europeans) being more prone than those in the Middle East or Asia. Within the UK, Scots are roughly 30 per cent more likely to get psoriasis than those in southern England. While the exact reason remains unclear—possibly linked to vitamin D levels or cold climate viruses—many patients report improved symptoms in summer due to sunlight's dampening effect on inflammatory cells. However, some female patients experience worsening symptoms with sun exposure.

Stress is another significant trigger, with a 2025 Chinese study finding that about 60 per cent of patients linked stressful events to symptom onset. Prof Griffiths explains that stress interacts with the immune system, making skin more susceptible to inflammation. Stress relief techniques like talking therapy and exercise are proven helpful, leading many psoriasis clinics to incorporate psychology teams. Excessive alcohol consumption and smoking also exacerbate problems; smoking is particularly linked to psoriasis on the palms and soles, and Prof Griffiths notes that patients who drink and smoke often find their condition harder to control.

Diet stands out as one of the most critical lifestyle factors. Obese patients are twice as likely to develop psoriasis, as fat cells produce inflammatory chemicals. Encouragingly, research, including a University of Oxford review of 14 medical studies, shows that weight loss can reverse the condition, with greater loss linked to greater improvement. Weight-loss injections are also being explored; a February trial of Mounjaro resulted in complete scab clearance for about a third of psoriasis patients. Eating frequency is also relevant: regular snacking is linked to psoriasis, while intermittent fasting appears to improve symptoms, possibly by promoting autophagy—the body's process of clearing damaged or inflamed cells. Constant snacking may inhibit this process.

Specific dietary choices have also been implicated. A 2017 National Psoriasis Foundation survey found that around a third of patients who eliminated red meat and pork experienced significant improvement. Diets high in ultra-processed foods (ready-meals, sugary snacks, pizza, crisps)—which are high in inflammatory sugar and salt—are linked to an increased risk of psoriasis, alongside other serious conditions. Consequently, Prof Griffiths strongly recommends the Mediterranean diet, rich in vegetables, fruits, whole grains, beans, nuts, and oily fish.

Current medical treatments for psoriasis typically begin with steroid creams to reduce inflammation. If these are ineffective, biologics—injections like adalimumab, infliximab, and secukinumab—can be prescribed. These advanced drugs, which stop the body from producing certain inflammatory cells, have been shown to reduce patches by up to 75 per cent. However, Prof Griffiths stresses that these powerful treatments work best when combined with comprehensive lifestyle adaptations, such as dietary changes. He emphasizes the crucial role of patients taking charge of their health.

A compelling case study is that of Stephanie Trotter, a 76-year-old charity executive from the Isle of Wight. In 2016, while building her new home, she developed severe, oozing, red and scaly patches across her body, including her scalp and mouth. Diagnosed with psoriasis, Stephanie found no relief from her GP or dermatologist, nor from numerous expensive creams. Desperate, she read about the benefits of cutting sugar for psoriasis. Recalling a period of high sugar intake (jam and toast) during her home renovations, she drastically cut sugar from her diet, eliminating jam, orange juice, and red wine. Incredibly, her red patches began to shrink within days, and within two months, all symptoms disappeared. Ten years later, Stephanie is healthier than ever and now advocates for the benefits of cutting sugar to other psoriasis patients, believing it is a worthwhile attempt for potential relief.