Psoriasis is more than a skin condition. The chronic inflammation that drives visible symptoms also affects internal organs and metabolic systems.
At a Glance
The Connection: The inflammation behind visible plaques does not stay in the skin. For the heart in particular, psoriasis appears to add risk beyond traditional factors like blood pressure and cholesterol.
The Risks: Psoriatic arthritis (around 1 in 5 patients), heart attack and stroke, fatty liver, and depression are the most consistently documented.
The Strategy: These risks tend to be higher with more severe, longer standing disease, so recognising symptoms beyond the skin early is critical for long term mobility and quality of life.
The figures on this page come from large population studies, so they describe averages across many thousands of people rather than a forecast for any one person. What they show fairly consistently is that these risks are real, that several climb with more severe or longer standing psoriasis, and that most can be watched for and acted on early alongside your dermatologist.
Joint Disease and Mobility
Psoriatic arthritis is the most prevalent comorbidity, affecting roughly one in five people living with psoriasis. The largest pooled analysis to date puts the figure near 20%, lower than the 30% often quoted elsewhere. It is more common in those with severe psoriasis and those who have had the disease for longer durations, and it can cause permanent joint damage if left untreated, making early recognition and intervention critical for preserving mobility and quality of life.
Research question
How many people with psoriasis develop psoriatic arthritis?
a proportion meta-analysis of 266 studies
2019🌍Multi-countryMeta-analysis
266
studies
976,408
patients
19.7%
pooled
A pooled prevalence, not a personal risk. Estimates varied widely between studies, so read this as a population average rather than your own odds.
Research finding
Across 266 studies, about 1 in 5 people with psoriasis also had psoriatic arthritis — a pooled 19.7%. Older sources often cite “up to 30%,” but the meta-analytic figure is lower.
share of psoriasis patients who also have psoriatic arthritis (bars scaled to a 25% axis)
All patients
19.7%
Europe
22.7%
N. America
19.5%
Asia
14.0%
Prevalence was higher (23.8%) in studies using the formal CASPAR classification criteria, and lower in children (3.3%).
Read with careBetween-study heterogeneity was very high, so the single pooled number hides a lot of variation. Whether an individual develops psoriatic arthritis depends on factors this average cannot predict — which is exactly why watching your own joints over time matters more than the headline percentage.
Researchers: F. Alinaghi, M. Calov, L.E. Kristensen, et al. · Journal of the American Academy of Dermatology, 2019
People with psoriasis face an increased risk of cardiovascular disease compared to the general population. More severe psoriasis is associated with higher odds of developing heart disease. Psoriasis may function as an independent risk factor for cardiovascular events: meaning the elevated risk exists beyond traditional factors like high blood pressure or cholesterol. Multiple cardiovascular risk factors cluster in psoriasis patients, including type 2 diabetes, obesity, metabolic syndrome, dyslipidemia, and hypertension.
Research question
Does psoriasis raise the risk of heart attack and stroke?
a systematic review and meta-analysis of 9 observational studies
2013🌍Multi-countryMeta-analysis
9
studies
201,239
mild psoriasis
17,415
severe psoriasis
All nine studies were observational. Risk was adjusted for some standard heart-disease factors, but this shows association, not proof that psoriasis itself causes the events.
Research finding
Risk rose with disease severity. People with severe psoriasis had about 1.7× the risk of heart attack and 1.6× the risk of stroke. In mild psoriasis the increase was smaller but still present.
risk of a cardiovascular event vs the general population (1.0 = no difference)
General population
ref
Heart attacksevere psoriasis
1.70×
Strokesevere psoriasis
1.56×
Heart attackmild psoriasis
1.29×
Severe psoriasis was also linked to higher cardiovascular mortality (1.39, 1.11–1.74). The pattern — bigger risk with more severe disease — is part of why researchers suspect inflammation itself plays a role.
Read with careSeverity was defined differently across studies, and adjustment for smoking, weight and blood pressure varied, so some residual confounding is likely. A larger 2022 cohort meta-analysis (31 studies) found the same direction with slightly smaller effects.
Researchers: E.J. Armstrong, C.T. Harskamp, A.W. Armstrong · Journal of the American Heart Association, 2013
Meta-analyses have established associations between psoriasis and non-alcoholic fatty liver disease, indicating that the inflammatory processes affect liver function and fat metabolism. The disease also shows links to inflammatory bowel disease and certain cancers, though the mechanisms underlying these associations require further research. These are example associations, not an exhaustive list, as triggers and comorbidities are personal and can only be tracked through testing.
Research question
Is psoriasis linked to fatty liver disease?
a systematic review and meta-analysis of 7 case-control studies
2015🌍Multi-countryMeta-analysis
7
studies
267,761
patients
0
prospective
All case-control studies, mostly low to moderate quality. This shows psoriasis and fatty liver tend to occur together, not that one causes the other.
Research finding
People with psoriasis had about 2.2× the odds of non-alcoholic fatty liver disease, and the odds climbed with more severe skin disease and with psoriatic arthritis.
odds of fatty liver disease (1.0 = no difference)
No psoriasis
ref
Any psoriasis
2.15×
Mod–severevs mild psoriasis
2.07×
With arthritispsoriatic arthritis
2.25×
Newer and larger meta-analyses land a little lower (around 1.7–2.2), but all point the same way: fatty liver is roughly twice as common in psoriasis.
Read with careOnly seven studies, all case-control and of low-to-moderate quality, with meaningful heterogeneity. Obesity and metabolic syndrome drive both conditions and were not fully separated out.
Researchers: R. Candia, A. Ruiz, R. Torres-Robles, et al. · Journal of the European Academy of Dermatology and Venereology, 2015
People with psoriasis are about 1.5 times more likely to experience clinical depression compared to controls. The psychological burden stems from multiple sources: living with a chronic condition, social stigmatisation, and low self-esteem. Emerging evidence suggests that systemic inflammation itself may play a direct role in developing depression, creating a biological link between the disease and mental health outcomes.
Research question
Are people with psoriasis more likely to be depressed?
a systematic review and meta-analysis of 98 studies
2014🌍Multi-countryMeta-analysis
98
studies
28%
had symptoms
12%
clinical depression
Most of the 98 studies had no control group. The odds ratio below comes from the subset with proper population-based comparison, which is the most reliable slice.
Research finding
In population-based studies, people with psoriasis were about 1.5× as likely to have clinical depression. Roughly 1 in 4 reported depressive symptoms on questionnaires.
odds of clinical depression vs the general population (1.0 = no difference)
General population
ref
Psoriasispopulation-based
1.57×
The 1.57 figure is the trustworthy one, drawn from studies with proper comparison groups. Systemic inflammation may play a direct role, not just the strain of living with a visible condition.
Read with careMost of the 98 studies came from specialist clinics without a control group, which can overstate how common depression looks. The odds ratio is drawn from the smaller, more reliable set of population-based studies.
Researchers: E.A. Dowlatshahi, M. Wakkee, L.R. Arends, T. Nijsten · Journal of Investigative Dermatology, 2014
Many people with severe psoriasis also experience poor sleep quality, which further compounds both physical symptoms and psychological wellbeing. Psoriasis triggers are always personal. Beyond dietary factors, stress, sleep, physical movement, and environmental shifts like cold weather can all influence your skin and internal health.
Watch the trend, not the day: Because these risks build slowly and usually show up beyond the skin, the useful habit is following changes over time rather than reacting to any single day. If new joint pain, stiffness, persistent low mood, or other symptoms appear, raise them with your doctor early rather than waiting for your skin to flare. Catching a comorbidity as it starts is far easier than managing it once it is established.
1.Alinaghi F, Calov M, Kristensen LE, et al. Prevalence of psoriatic arthritis in patients with psoriasis: a systematic review and meta-analysis of observational and clinical studies. J Am Acad Dermatol, 2019
3.Armstrong EJ, Harskamp CT, Armstrong AW. Psoriasis and major adverse cardiovascular events: a systematic review and meta-analysis of observational studies. J Am Heart Assoc, 2013
4.Cardiovascular risk factors in chronic plaque psoriasis. PMC6141315
5.Candia R, Ruiz A, Torres-Robles R, et al. Risk of non-alcoholic fatty liver disease in patients with psoriasis: a systematic review and meta-analysis. J Eur Acad Dermatol Venereol, 2015
6.Dowlatshahi EA, Wakkee M, Arends LR, Nijsten T. The prevalence and odds of depressive symptoms and clinical depression in psoriasis patients: a systematic review and meta-analysis. J Invest Dermatol, 2014
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