What Causes Psoriasis Flare-Ups? Common Triggers And How To Manage Them

TLDR: What causes psoriasis flare-ups? In short, specific triggers, such as stress, cold weather, skin injury, infection, or certain medications, activate an already overactive immune response in the skin, causing psoriasis flare-ups to worsen or reappear. Psoriasis itself is caused by an immune system malfunction that speeds up skin cell turnover, but triggers are what set off a flare on top of that underlying condition. Identifying your personal triggers is the first step toward fewer, milder flares, and a board-certified dermatologist can help you build a treatment plan that keeps them under control.

If you have psoriasis, you already know it does not behave the same way twice. Some weeks your skin is calm. Other weeks it flares seemingly out of nowhere. That unpredictability is frustrating, but it is not random. Flares almost always trace back to a trigger, even when it is not obvious at first.

What Is The Difference Between A Cause And A Trigger?

This distinction matters more than most articles let on. Psoriasis itself is caused by a malfunctioning immune system that tells skin cells to multiply too quickly, causing patches of skin to become scaly and inflamed. Instead of shedding naturally over about a month, those cells pile up on the surface in a matter of days, forming the raised, scaly plaques associated with the condition. According to the National Institute of Arthritis and Musculoskeletal and Skin Diseases, scientists do not fully understand what causes psoriasis, but they know it involves a mix of genetics and environmental factors.

A trigger, on the other hand, does not cause psoriasis. It activates or worsens psoriasis that is already there. You can have the underlying condition for years with mild or no symptoms, then experience a sudden flare after a specific trigger hits.

What Are The Most Common Psoriasis Triggers?

Stress: Stress is one of the most frequently reported flare triggers. It works both ways: high stress can trigger a flare, and a flare itself can create more stress, which can extend or worsen the outbreak.

Cold, Dry Weather: Cold air pulls moisture from the skin, and dry skin is more prone to cracking and irritation, both of which can set off a flare. Many patients notice their symptoms ease in warm, humid months and worsen in winter.

Skin Injury (Koebner Phenomenon): Cuts, scrapes, sunburns, bug bites, tattoos, and even a hard bump can trigger new psoriasis plaques at the exact site of the injury. Dermatologists call this the Koebner phenomenon, and it is one of the more distinct patterns of psoriasis flares.

Infections: Strep throat is a well-documented trigger, particularly for guttate psoriasis, a form marked by small, drop-shaped lesions. A 2024 review in Cell Communication and Signaling confirms that throat infections caused by Streptococcus pyogenes can trigger or worsen psoriatic skin lesions in both plaque and guttate forms. Other infections, including upper respiratory infections and skin infections, can also provoke a flare.

Certain Medications: A handful of medications are known to worsen psoriasis in some patients, including lithium, antimalarial drugs, and some beta-blockers used for blood pressure and heart conditions. If you notice a flare after starting a new medication, do not stop taking it on your own. Talk to your prescribing provider first.

Alcohol and Smoking: Both are associated with more frequent and more severe flares. Smoking is also linked to a higher risk of developing psoriasis in the first place.

Hormonal Changes: Puberty, pregnancy, and menopause can all influence psoriasis activity, since hormone shifts affect the immune system.

Can Diet Affect Psoriasis Flares?

Diet is not a proven trigger the way stress or skin injury is, but many patients report that certain foods, alcohol, and weight gain seem to correlate with worse symptoms. Carrying extra weight is associated with more severe psoriasis, and losing weight has helped some patients see improvement. If you suspect a food is worsening your flares, track it and bring the pattern to your appointment so your provider can help you sort correlation from coincidence.

How Do I Figure Out My Own Psoriasis Triggers?

Triggers are highly individual. What flares one person’s psoriasis may do nothing to another’s. A simple flare journal, noting stress levels, weather, illness, new products, or medication changes alongside your symptoms, can help you and your dermatologist spot patterns over a few months.

When Should I See A Dermatologist For Psoriasis?

If you are dealing with frequent flares, spreading plaques, joint pain, or symptoms that are not responding to over-the-counter treatment, it is time for an appointment with a board-certified dermatologist. Our general dermatology team treats psoriasis and other chronic skin disorders every day. Psoriasis is a chronic condition, but it is a manageable one with the right combination of topical treatment, lifestyle adjustments, and in some cases, prescription or biologic therapy. A dermatologist can also confirm the diagnosis, since psoriasis is sometimes mistaken for eczema or other skin conditions that require different treatment entirely.

Frequently Asked Questions