Can Seasonal Viral Infections Trigger Autoimmune Flare-Up?

Have you ever noticed that a person with rheumatoid arthritis experiences sudden flare-ups when they have a cold, fever, or other seasonal infection? Most people think it is normal and happens randomly, whereas in reality, there is a strong link that we are unaware of.

Seasonal viral infections such as the common cold, influenza, and other respiratory illnesses can significantly trigger flare-ups in people with an autoimmune disease.

For most people, these infections cause temporary symptoms that improve within a few days or weeks. However, for people living with autoimmune diseases, seasonal viral infections can sometimes worsen their condition, leading to an autoimmune flare.

Although not every infection will trigger a flare, research published in the journal ‘Viruses’ suggests that viral illnesses can increase the risk of symptoms returning or becoming more severe.

What Is an Autoimmune Flare?

The National Institute of Arthritis and Musculoskeletal and Skin Diseases defines an autoimmune flare as a period when the disease becomes more active, causing existing symptoms to worsen or new symptoms to appear. Though the symptoms vary depending on what autoimmune disease a person has, common flare-ups include:

• Joint pain and swelling
• Extreme tiredness
• Skin rashes
• Digestive problems
• Muscle pain
• Fever
• Increased stiffness
• Difficulty carrying out daily activities

NOTE: Flare-ups can last from a few days to several weeks.

Also Read: Autoimmune Disease vs Weak Immunity: What is the Difference?

How Can Seasonal Viral Infections Trigger Flares?

According to Dr Tushar Tayal, Associate Director - Internal Medicine, CK Birla Hospital, Gurugram, “Viral infections that occur on a seasonal basis have often been viewed as minor illnesses. However, for people with autoimmune diseases, these infections may have a much greater impact.”

Studies suggest that some viruses commonly seen during colder months can act as triggers for autoimmune flare-ups. While these infections do not cause autoimmune diseases in every case, they may influence how active an existing autoimmune condition becomes.

When a virus enters the body, the immune system launches a strong defence to fight the infection. This involves the release of inflammatory chemicals and the activation of specialised immune cells designed to eliminate the virus.

In people with autoimmune diseases, this heightened immune response may unintentionally reactivate the abnormal immune activity that causes their condition. As a result, symptoms such as joint pain, fatigue, skin rashes, or digestive problems may worsen after a viral illness.

Why Does This Happen?

There are several theories on the connection between viral infections and autoimmune disease.

One important theory is known as molecular mimicry. Sjogren's Foundation explains that some viral proteins closely resemble those found in the body's own tissues. After fighting the virus, the immune system may mistakenly attack healthy cells because it cannot clearly distinguish between the virus and normal body tissue.

Also Read: Why Is Autoimmune Disease So Hard to Diagnose? The Science Behind the Delay

Another possible explanation is that viral infections increase inflammation throughout the body. While inflammation helps fight infection, it may also stimulate autoimmune activity in people whose immune systems are already overactive.

The stress that an infection places on the body may also contribute to disease flare-ups, particularly in people whose autoimmune condition is already difficult to control.

Dr Tayal explains that rheumatologists and other specialists frequently observe disease flare-ups following illnesses such as influenza and other seasonal viral infections. While infections are not the sole cause of autoimmune disease, they can influence its progression and make symptoms temporarily worse.

This is why doctors often advise people with autoimmune conditions to be especially careful during seasons when viral infections are more common.

Autoimmune Diseases Flare-ups Due To Seasonal or Viral Illnesses

Many autoimmune diseases may become more active following a viral infection, although the symptoms vary depending on the condition.

• People with rheumatoid arthritis may notice increased joint pain, swelling, and stiffness.
• Those with lupus may experience fatigue, skin rashes, or worsening inflammation affecting different organs.
• Individuals with multiple sclerosis may find that existing neurological symptoms temporarily worsen.
• People with inflammatory bowel disease may develop increased abdominal pain, diarrhoea, or digestive discomfort.
• Those with psoriasis may notice more widespread or severe skin plaques.

Not everyone experiences flares after an infection, and the severity can differ from person to person.

Also Read: Can Vitamin D Deficiency Affect Autoimmune Diseases?

The Importance of Infection Prevention for Autoimmune Patients

Because viral illnesses may increase the risk of autoimmune flare-ups, preventing infection becomes an important part of managing autoimmune disease.

Dr Tayal highlights several practical steps that can reduce the chance of becoming ill, including:

• Washing hands regularly with soap and water.
• Getting enough sleep every night.
• Eating a balanced and nutritious diet.
• Staying physically active where possible.
• Avoiding close contact with people who are unwell.
• Keeping vaccinations up to date, following medical advice.

These everyday habits help reduce exposure to seasonal viruses and support the immune system's normal function.

Vaccination and Autoimmune Disease

According to the Centers for Disease Control and Prevention (CDC), vaccination is one of the most effective ways to reduce the risk of certain viral infections, including influenza.

• For people with autoimmune diseases, vaccination is recommended because preventing infection may also reduce the likelihood of disease flare-ups caused by illness.
• However, vaccination plans should always be discussed with a healthcare professional, particularly for people taking medicines that suppress the immune system.

Doctors can advise which vaccines are appropriate based on the individual's condition, treatment, and overall health.

Also Read: Top 3 Anti-Inflammatory Ingredients You Must Have In Your Diet In Winter

When To See a Doctor?

People with autoimmune diseases should pay close attention to any changes in their symptoms, particularly after recovering from a viral infection. You must consult your doctor if you experience the following symptoms:

• Severe or persistent joint pain
• New or worsening skin rashes
• Increased fatigue that does not improve
• Digestive symptoms that become more severe
• Difficulty breathing or acute chest pain
• High fever

Besides, any sudden or significant change in the usual pattern of symptoms must also be reported.

Early medical intervention can help determine whether the symptoms are due to an infection, an autoimmune flare, or another health problem.

Managing Autoimmune Disease During Viral Seasons

People living with autoimmune diseases cannot dodge every viral infection, but careful management can reduce the risk of complications. Here are some suggestions by Dr Tayal:

• Take prescribed medication as directed by your doctor.
• Maintain healthy lifestyle habits to keep autoimmune conditions under better control.
• Manage stress, as emotional and physical stress may contribute to disease activity. Take adequate rest.
• Ensure good nutrition to support overall well-being throughout the year.

Final Word

Seasonal viral infections are usually short-lived, but for people with autoimmune diseases, they can sometimes trigger disease flare-ups by activating an already overactive immune system. Although seasonal viruses cannot always be avoided, understanding their potential impact allows people with autoimmune diseases to take sensible precautions, recognise early warning signs, and work closely with their healthcare team to keep their condition as stable as possible.