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No single cause explains why one person develops psoriasis and another doesn't, but researchers have identified clear risk factors. Family history tops the list — having a sibling with psoriasis can raise risk four to six times over. Smoking, obesity, heavy alcohol use, high stress, certain infectio
The biggest risk factors for psoriasis are family history, smoking, obesity, heavy alcohol use, high stress, certain infections, and specific medications. Genetics plays a major role — researchers estimate about one-third of people with psoriasis have a first-degree relative with the condition — but environmental factors often determine whether and when psoriasis actually develops. No single factor guarantees someone will get psoriasis, and having several risk factors doesn't mean it's inevitable either.
Understanding these risk factors matters for two reasons: some, like smoking and weight, can be modified, and recognizing personal risk factors can help people catch symptoms early or manage flares more effectively once diagnosed.
Family history is considered the most significant risk factor for psoriasis. According to research cited by MyPsoriasisTeam, people with a sibling who has psoriasis are four to six times more likely to develop the condition themselves. Medscape similarly describes genetic predisposition as probably the most important risk factor, noting that multiple genes contribute to susceptibility.
That said, genetics alone don't explain everything. Many people with a strong family history never develop psoriasis, while others with no known family connection do. NIAMS describes psoriasis as involving a mix of genetics and environmental factors, meaning genes appear to set the stage for risk, while other triggers often determine whether the disease actually activates.
Smoking. Smoking tobacco increases the risk of developing psoriasis and can also make existing psoriasis more severe. A 2020 meta-analysis found that both current and former smokers had a higher risk of psoriasis compared with people who never smoked, and research has shown a particularly strong connection between smoking and palmoplantar psoriasis, a form that affects the palms and soles. Mayo Clinic notes smoking may also play a role in the disease's initial development, not just its severity.
Obesity. A higher body mass index is consistently linked to increased psoriasis risk. Fat tissue produces inflammatory proteins called cytokines, and this response tends to increase alongside BMI, which may help explain why obesity shows up so often in psoriasis research. Weight also affects treatment — Mayo Clinic notes that being overweight can make psoriasis harder to treat, not just more likely to occur.
Heavy alcohol use. Alcohol has been identified as both a risk factor for developing psoriasis and a factor that can worsen existing symptoms. Reducing alcohol intake is a commonly cited lifestyle recommendation for people managing psoriasis flares.
Chronic stress. Because stress affects the immune system, high stress levels are associated with increased psoriasis risk and more frequent flares. Mayo Clinic describes cases where a high-stress event triggered a dramatic outbreak, with skin appearing normal one day and then developing widespread patches within days.
Certain infections are known to trigger psoriasis, particularly in people already genetically predisposed. Streptococcal infections, such as strep throat, are especially well documented as triggers, and research has linked family history, stressful life events, and recent infections to first episodes of guttate psoriasis, a form marked by small, drop-shaped patches.
Some medications are also associated with triggering or worsening psoriasis, including lithium, interferons, beta blockers, and antimalarial drugs. Pregnancy is another factor that can shift immune activity in ways that either improve psoriasis or trigger flares, sometimes including more severe pustular flares. Anyone starting a new medication with a personal or family history of psoriasis may want to mention that history to their prescribing doctor.
It helps to separate psoriasis risk factors into two categories:
Factors outside a person's control:
Family history and genetic predisposition
Age (though psoriasis can develop at any age)
Certain necessary medications for unrelated conditions
Pregnancy-related immune changes
Factors that can potentially be modified:
Smoking status
Body weight
Alcohol consumption
Stress management
Avoiding known personal triggers where possible
This distinction doesn't mean psoriasis is anyone's fault — genetics and immune system function are the underlying drivers, and lifestyle factors mainly shift risk rather than single-handedly causing the disease. But for people already living with psoriasis, addressing the modifiable factors can meaningfully affect flare frequency and severity.
Psoriasis doesn't just raise the risk of skin symptoms — several of the same risk factors also connect it to other health conditions. Research has found that people with psoriasis have a higher prevalence of smoking, obesity, high alcohol use, low physical activity, and unfavorable cholesterol profiles compared with people who don't have psoriasis. Studies have also found people with severe psoriasis face increased risk of diabetes and other cardiometabolic conditions.
This overlapping risk is part of why dermatologists and primary care doctors often coordinate care for psoriasis patients — managing weight, blood pressure, and cardiovascular risk isn't just general health advice, it's specifically relevant to psoriasis management too.
Is psoriasis hereditary?
Yes, to a significant degree. Family history is considered the strongest known risk factor, and research shows having a sibling with psoriasis can raise personal risk four to six times. However, many people with a family history never develop psoriasis, so genetics alone don't determine the outcome.
Does stress cause psoriasis flares?
Stress is a well-documented trigger. Because it affects immune system activity, high stress levels are linked to both the onset of psoriasis and more frequent or severe flares in people who already have it. Managing stress is a common part of psoriasis care, though it works alongside medical treatment rather than replacing it.
Can losing weight reduce psoriasis symptoms?
Obesity is a known risk factor, and higher BMI is linked to more psoriasis-related inflammation. While weight loss alone won't cure psoriasis, maintaining a healthy weight may help make the condition easier to treat and manage over time.
Does smoking make psoriasis worse?
Yes. Smoking both increases the risk of developing psoriasis and can worsen its severity once someone has it. Research has found a particularly strong link between smoking and palmoplantar psoriasis, which affects the palms and soles.
Can a specific infection trigger psoriasis for the first time?
Yes, particularly in people already genetically predisposed. Strep throat is one of the most well-documented infectious triggers, especially for guttate psoriasis, a form that often appears suddenly after an infection, particularly in children and young adults.
Psoriasis risk comes from a mix of genetics and environmental factors, and no single risk factor tells the whole story. Family history carries the most weight, but smoking, obesity, stress, certain infections, and specific medications all contribute too. For anyone managing psoriasis, addressing the modifiable risk factors — quitting smoking, managing weight, reducing stress — won't eliminate the condition, but it can meaningfully affect how often and how severely it flares.
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