The Connection Between Blood Type and Autoimmune Disease

Image courtesy of Medical News Today.

Medical researchers have long asked the question: Is there a connection between one’s blood type and autoimmune disease?

Clinical studies have had varied results, mostly due to the small sample sizes of each study. Though this area needs more research, this blog post will cover some of the research that has been published so far.

Study: Rheumatic Diseases and ABO Blood Types

A 2017 study in Turkey sought to find a link between particular blood types and the incidence of rheumatic disease. Rheumatic disease includes over 200 conditions that cause pain in your joints, connective tissue, tendons, and cartilage; many of these conditions are autoimmune diseases such as rheumatoid arthritis, Sjogren’s Syndrome, and systemic lupus erythematosus.

The researchers assessed 823 patients, with the following distribution of blood types: 42.5% patients had type A blood, 33.2% had type O blood, 15.4% had type B, and 8.9% had type AB. Each patient in the study had at least one of the following nine rheumatic diseases:

  • Behçet’s disease
  • Familial Mediterranean fever (FMF)
  • Rheumatoid arthritis (RA)
  • Spondyloarthropathy
  • Systemic lupus erythematosus (SLE)
  • Systemic sclerosis (SSc)
  • Sjogren’s syndrome (SjS)
  • Undifferentiated connective tissue disease
  • Vasculitis

Their study found that there was a significant difference in the distribution of blood types among those with rheumatic diseases. The most common autoimmune diseases among those with type A blood were: rheumatoid arthritis, spondyloarthropathy, vasculitis, Behçet’s disease, and undifferentiated connective tissue disease.

The most common autoimmune diseases among those with type O blood were: systemic lupus erythematosus, systemic sclerosis, and Sjogren’s syndrome. The researchers also noted that SLE, SSc and SjS are the connective tissue disorders frequently observed with antinuclear antibodies (ANA). The rheumatic disease familial Mediterranean fever was also found to be most common in those with type O blood.

Those with blood type AB were observed to be the least likely to suffer from rheumatic disease. However, it should be noted that type AB blood is also the most rare blood type in general, and represented the smallest amount of patients studied.

In addition, it was found that there was a significant difference in the distribution of Rh factor in rheumatic diseases. Of those with rheumatic diseases, 92.2% patients were Rh positive and only 7.8% patients were Rh negative. However, it should once again be noted that a positive Rhesus Factor (Rh+) is also more common among the general population than a negative Rhesus Factor (Rh-).

Is there a link between autoimmune disease and blood type?

So, if you have blood types A or O, does this mean you are more likely to get an autoimmune disease? The researchers who conducted this study concluded: “…we believe that the higher incidence of different rheumatic diseases in different blood types is associated with different genetic predispositions.”

In other words, since blood type is inherited (i.e. genetic), the results of the study point to a likely connection between certain genes and the increased predisposition for developing an autoimmune or rheumatic disease.

Do you know your blood type?

I, for one, do not know my own blood type. This is somewhat ironic, since I’ve undergone many blood tests as part of my Sjogren’s syndrome diagnosis, as well as for monitoring my liver enzyme levels while taking certain medications to control my autoimmune symptoms.

I actually did ask my primary care doctor what my blood type was the last time he ordered a test, and he advised that finding out your blood type is not a common part of the blood testing routine, and thus, he didn’t know what mine was.

If you have an autoimmune disease (or multiple diseases), and you know your blood type, comment below and let us know, are your condition and blood type consistent with the results of this study?

March is Autoimmune Disease Awareness Month

According to the American Autoimmune & Related Diseases Association (AARDA), March is officially Autoimmune Disease Awareness Month (ADAM)! During this month, the organization works to raise awareness about autoimmune diseases among the general public. With increased awareness about autoimmune diseases, the AARDA says that they will be able to secure more funding for medical research, new treatment options, and improved patient diagnostics.

According to the AARDA, there are over 100 known autoimmune diseases, which are responsible for causing widespread chronic illness and pain. While many individuals have heard of at least one autoimmune disease, like rheumatoid arthritis, lupus, multiple sclerosis, type 1 diabetes, or Crohn’s disease, few members of the general public know that these conditions are autoimmune in nature, and all stem from the commonality of an overactive immune system.

There is also widespread misinformation about the term ‘autoimmune’. I once read on the Reddit forum r/autoimmune about a woman who, during a doctor’s appointment, told a nurse that she had an autoimmune disease. The nurse thought that this meant that the patient had HIV/AIDS, which is not an autoimmune disease, but rather an immunodeficiency caused by a virus. These misconceptions about autoimmune disease are another reason why it’s important to raise awareness and educate the public – and even healthcare professionals – about this cause.

While the exact number of autoimmune disease patients is unknown, it’s estimated that autoimmune conditions impact over 24 million Americans. An additional 8 million Americans have auto-antibodies, blood molecules that may predispose them to developing an autoimmune disease in the future. This isn’t counting the many individuals who go undiagnosed as a result of their symptoms being dismissed, a misdiagnosis, or due to their healthcare provider lacking knowledge about autoimmune disease.

Autoimmune diseases are also a leading cause of death and disability. Dr. Anthony Fauci, a leading allergy and disease expert, estimated back in 2001 that autoimmune disease treatment costs in the US exceeded $100 billion annually. While this may seem like a staggering figure, it’s possible that the true cost is much higher, since, as noted above, many individuals go undiagnosed or are misdiagnosed, and new autoimmune diseases are being discovered with each passing year. Furthermore, a more recent 2020 study showed that the incidence of autoimmune disease is on the rise in the US – so these cost figures (which are now 20 years old), are most likely continuing to increase.

The fact that autoimmune diseases pose an extreme burden on our healthcare system is just another reason that it’s important for the general public to be educated about these conditions, and why more resources need to be dedicated towards research and finding a cure.

So what can you do to help? If you or someone you love has an autoimmune disease, consider raising awareness (with the patient’s permission, of course), by posting about it on social media with the hashtag #ADAM for Autoimmune Disease Awareness Month. By sharing your story or the stories of others, you can raise awareness and be a voice for the millions of people suffering from autoimmune diseases worldwide.

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Why Autoimmune Patients with COVID-19 Should Beware of the Cytokine Storm

As the SARS-CoV-2 virus responsible for the COVID-19 disease continues to infect people and claim lives across the globe, scientists and medical professionals are learning more about its impact on patients.

One interesting phenomenon that’s been observed is that some coronavirus patients experience relatively mild to moderate symptoms, while others experience severe, life-threatening problems that can land them in the ER. According to Sharp Health News, the virus itself may not be entirely to blame for this, but rather, an overreaction by the body’s immune system.

When a foreign agent, such as a virus, invades your body, your immune cells secrete cytokines, which are molecules that initiate an immune response. However, in some cases, immune cells continue to secrete cytokines, even after a sufficient immune response has been mounted. This is called a ‘cytokine storm’ and the overproduction of these molecules can cause a harmful inflammatory response in the body.

Certain people are more susceptible to cytokine storms than others; for example, there is evidence that those with genetic mutations in their immune cells are more vulnerable. According to creakyjoints.org, those with autoimmune conditions often have abnormally high levels of these cytokines, which is why autoimmune patients often take immune-suppressing medications. However, a cytokine storm isn’t the same as an autoimmune disease flare, though they can be related.

As detailed by creakyjoints.org, some autoimmune patients end up with cytokine storms unrelated to COVID-19. Dr. Randy Cron, a pediatric rheumatologist and author of the book Cytokine Storm Syndrome commented, “About 10% of patients with juvenile idiopathic arthritis will experience [a cytokine storm]; in some cases, multiple times.”

With regards to COVID-19, which is respiratory in nature, a cytokine storm can gravely impact a patient. Acute lung injury (ALI) is a common consequence of a cytokine storm occurring in the lungs, and if a lung infection is severe, the inflammation will spread to the rest of the body via one’s blood circulation and cause sepsis. In some cases, the immune response to an infection can even be deadly.

That’s why it’s important to ‘calm the storm’ and prevent a cytokine storm before it even happens. One type of treatment being explored for COVID-19 is hydroxychloroquine, which is an antiviral and immunosuppressant drug used to treat malaria and autoimmune diseases like lupus, rheumatoid arthritis (RA) and Sjogren’s. Although the medication is still undergoing clinical trials, many are hopeful that this drug will serve as a treatment to halt the progression of COVID-19.

Besides pharmaceutical therapies, Sharp Health News cites curcumin, a compound found in turmeric, as beneficial for its anti-inflammatory properties. A 2015 study states that in lab experiments, researchers found that curcumin blocked the release of the cytokines that are responsible for inflammation.

All in all, it’s important for autoimmune patients to guard against the coronavirus by adhering to strict hygiene guidelines, such as hand washing thoroughly with soap and water, avoiding close contact with others, and disinfecting surfaces routinely. Remember, prevention is the best form of treatment, and can help those with autoimmune disease to avoid a damaging cytokine storm.