Three institutions publish a psoriasis trigger list. Between them they name infection, injury, weather, medicines, smoking and stress. None of the three names a food.
Psoriasis has six triggers that doctors actually name, and diet is not among them.
The disease is immune driven. Skin cells are told to multiply far faster than they should. They pile up as plaques. The old ones cannot shed fast enough.
Below are the six triggers the three institutions name, what to do about each, and why the food question keeps getting the wrong answer.
Six triggers, and five of them can be managed
NIAMS says psoriasis involves a mix of genes and outside factors. It says managing common triggers can help keep symptoms in check. It names stress and skin injuries as two of them.
Three published lists overlap almost perfectly. Six items appear across them.
- Infection, especially strep throat. NIAMS names streptococcal and HIV infections among the external factors. Mayo Clinic says guttate psoriasis is usually triggered by a bacterial infection such as strep throat. Cleveland Clinic lists streptococcal infection too.
- A cut, a scrape or a bad sunburn. Mayo Clinic names injury to the skin, giving a cut or scrape, a bug bite and a severe sunburn as examples. Cleveland Clinic adds surgery to the same list.
- Cold, dry weather. Mayo Clinic names weather, especially cold and dry conditions, among common triggers. Cleveland Clinic lists changes in body temperature due to the weather.
- A medicine already in the cabinet. Mayo Clinic names lithium, high blood pressure drugs and antimalarial drugs. Cleveland Clinic names lithium and beta blockers. NIAMS names drugs used for heart disease, malaria and mental health problems.
- Smoking and heavy drinking. Mayo Clinic names smoking and exposure to secondhand smoke, and heavy alcohol consumption. It also says smoking may increase the severity of the disease. NIAMS lists smoking and obesity.
- Emotional stress. Cleveland Clinic names emotional stress as a common trigger for flare ups. NIAMS says managing common triggers such as stress can help keep symptoms under control.
Mayo Clinic adds a seventh that catches people out. Rapid withdrawal of oral or injected corticosteroids is on its trigger list. That is a reason to taper with a prescriber rather than stop.
Why diet keeps getting blamed, and what the lists actually say
Mayo Clinic publishes the longest trigger list of the three. Infections, weather, skin injury, smoking, heavy alcohol, certain medications and steroid withdrawal.
No food appears on it. None appears on Cleveland Clinic's list either.
NIAMS comes closest to a food link, and it is worth reading carefully. It lists obesity among the external factors that may increase the chances of developing psoriasis.
That is a different claim. It is about who develops the disease, not about what sets off a flare in someone who already has it.
The practical version is simple. Weight and alcohol are worth attention on the published evidence. An elimination diet is not on any of the three lists.
Psoriasis is a chronic disease in which the immune system becomes overactive, causing skin cells to multiply too quickly.
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⬇ Download your plan (PDF)The parts of psoriasis that are not on the surface
Cleveland Clinic says psoriasis is an autoimmune condition that causes inflammation in your skin. The plaques are what that inflammation looks like from outside.
It also says more than 3 percent of the US population has psoriasis. About 80 to 90 percent of them have the plaque form.
NIAMS goes further on the risks that travel with it. It names psoriatic arthritis. It names heart attacks and strokes. It names anxiety and depression too.
It also flags the timing. Untreated psoriatic arthritis can lead to lasting damage. Stiff, swollen or painful joints are worth an early appointment, not a wait.
Cleveland Clinic says there is no cure. Treatment aims at remission instead. It says remission can last a few months to a couple of years.
Three things people still get wrong about psoriasis
Three beliefs cause real harm, and each has a direct answer.
It is contagious. It is not. Cleveland Clinic says you cannot get psoriasis by touching another person's rash. Mayo Clinic says the same. It is worth saying out loud at home. The belief costs people more than the rash does.
It is only a skin problem. NIAMS disagrees. It says psoriasis carries the risk of other serious conditions. It names psoriatic arthritis. It names heart attacks and strokes. It names mental health problems. Cleveland Clinic says about 1 in 3 diagnosed people also get arthritis.
It is the same as eczema. Cleveland Clinic says they are two different skin conditions. Psoriasis plaques cause areas of thick skin covered in scales. Eczema causes a rash of dry and bumpy skin, and it says eczema typically causes more intense itching.
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This article is education, not medical advice. Cleveland Clinic says severe pain, swelling and a fever are symptoms of infection and need a call to your provider. NIAMS says untreated psoriatic arthritis can lead to irreversible damage, so joint symptoms need a prompt appointment.