Why Does My Psoriasis Keep Flaring Up? 10 Common Triggers Explained

Stress is one of the most commonly reported psoriasis triggers. Stress can affect the immune system and increase inflammation throughout the body, which may contribute to flare-ups. While eliminating stress completely is unrealistic, strategies such as regular exercise, relaxation techniques, mindfulness and adequate sleep may help reduce its impact.

Many patients notice that psoriasis worsens during the autumn and winter months. Cold air contributes to drier skin and increased irritation, while indoor heating can further reduce humidity. Moisturising regularly and protecting exposed skin from harsh weather conditions is particularly important during colder months.

Damage to the skin — including scratches, cuts, burns, sunburn, insect bites and friction from clothing — can sometimes trigger new psoriasis lesions. This is known as the Koebner response. Even persistent scratching can worsen symptoms. Taking steps to reduce itching and protect the skin barrier may help minimise this risk.

Certain infections are known to trigger psoriasis flare-ups — particularly throat infections, respiratory infections and viral illnesses. Infections can stimulate the immune system, which may contribute to increased psoriasis activity. Some people first develop psoriasis following an infection. If you notice a connection between infections and flare-ups, discuss this with a healthcare professional.

Smoking is associated with an increased risk of psoriasis and may contribute to more severe symptoms. Research suggests smoking can increase inflammation, affect immune system function and reduce treatment effectiveness in some individuals. While quitting can be challenging, many patients find that reducing or stopping smoking becomes an important part of their long-term management plan.

Alcohol can be a trigger for some people with psoriasis. While not everyone is affected, excessive consumption may increase inflammation, trigger flare-ups and interfere with treatment effectiveness. Keeping a symptom diary can help identify whether alcohol affects your psoriasis personally.

Some medications may contribute to psoriasis flare-ups in susceptible individuals — including certain blood pressure medications, some antimalarial medicines, lithium and certain anti-inflammatory medicines. This does not mean you should stop any prescribed medication. If you think a medication may be affecting your psoriasis, speak to a healthcare professional before making any changes.

Dry skin can make psoriasis symptoms more noticeable and uncomfortable, contributing to increased itching, flaking, irritation and cracking. Regular use of emollients and moisturisers helps support the skin barrier and improve overall comfort. For many patients, moisturising consistently is one of the simplest and most effective ways to reduce symptom severity.

Stopping treatment suddenly or using it inconsistently can sometimes lead to worsening symptoms. Many psoriasis treatments require consistent use to achieve and maintain their benefits — forgetting applications, stopping as soon as symptoms improve, or frequently changing products are common causes of unnecessary flare-ups. If you’re unsure whether your treatment is working, seek advice rather than stopping abruptly.

Sleep plays an important role in immune system function. Poor sleep may contribute to increased stress levels, greater inflammation and worsening symptoms. Other lifestyle factors including lack of physical activity, poor diet and excess body weight can also influence psoriasis. While lifestyle changes alone are unlikely to cure psoriasis, they can support better symptom control when combined with appropriate treatment.