Can SAPHO Syndrome Affect the Eyes or Intestines? Signs

While SAPHO syndrome primarily affects the bones, joints, and skin, it can occasionally coexist with inflammation in the eyes or the intestines ^[1][2]. However, these complications are not present in most people with SAPHO and are not required to make a diagnosis ^[3][4].

When eye or bowel inflammation does occur alongside SAPHO, it is sometimes because these conditions share underlying inflammatory mechanisms, or because they overlap with a family of diseases known as the spondyloarthritis spectrum (inflammatory conditions that typically affect the spine and joints, and sometimes the eyes or bowel) ^[5][6]. However, the exact relationship is still debated, and having SAPHO does not mean you will definitely develop these other conditions ^[7][2].

If you develop new eye pain or persistent digestive issues, it is important not to dismiss them as just another “SAPHO flare.” These symptoms require specialized evaluation because they could represent a separate coexisting condition, an infection, or a medication side effect.

The Connection to Eye Inflammation

Eye inflammation is a rare occurrence in people with SAPHO syndrome ^[1][8]. Most of the evidence linking the two comes from individual case reports rather than large studies, meaning reliable frequency estimates are lacking and it is considered uncommon ^[1][3].

Reported eye problems associated with SAPHO have included:

• Uveitis: Inflammation of the uvea (the middle layer of the eye). This is an ophthalmic emergency that can threaten your vision ^[9].
• Scleritis: Inflammation of the sclera (the white outer protective layer of the eye) ^[1].
• Retinal Vasculitis: Inflammation of the blood vessels inside the retina at the back of the eye ^[3].

Because people with SAPHO may also develop completely separate eye conditions (such as infections or other autoimmune eye diseases), a proper diagnosis requires an eye specialist (ophthalmologist) ^[10][11].

Eye Symptoms: When to Seek Care

Seek Emergency Care (Emergency Department or Emergency Eye Service):
Go to an emergency room immediately if you experience ^[9][12]:

• Sudden, major loss of vision or rapidly worsening vision
• A “curtain” or shadow falling over your vision
• Sudden flashes of light accompanied by new floaters
• Severe, unbearable eye pain

Seek Prompt Same-Day Ophthalmology Care:
Contact an eye doctor for a same-day evaluation if you develop ^[13][12]:

• A painful, red eye
• Severe sensitivity to light (photophobia)
• Blurred or reduced vision
• New floaters or spots in your vision

Note: A red eye can also be caused by an infection, a scratched cornea, or other common issues. Never use leftover steroid eye drops or assume all redness is uveitis ^[13]. If you cannot get a same-day appointment with an eye doctor for these symptoms, go to an urgent care or emergency department.

An ophthalmologist will use specialized equipment, like a slit-lamp examination (a microscope with a bright light) or retinal imaging, to see exactly where the inflammation is located and how best to treat it ^[1][10].

The Connection to Inflammatory Bowel Disease (IBD)

SAPHO syndrome can coexist with inflammatory bowel disease (IBD), which includes Crohn’s disease and ulcerative colitis ^[14][2]. Estimates of how often they overlap vary widely depending on how the studies were designed. While older literature sometimes estimated that about 10% of SAPHO patients have IBD ^[15], one more recent study of 233 SAPHO patients found that 1.7% of that specific group had ulcerative colitis ^[4]. The exact risk for an individual with SAPHO is still not completely understood ^[2].

Do I need routine screening for IBD?
Routine endoscopic screening (like a colonoscopy) is generally not recommended for every person with SAPHO if they have no bowel symptoms ^[16]. Doctors usually only recommend testing if you develop digestive symptoms, have a family history of IBD, or have abnormal blood work (like anemia or very high inflammatory markers) ^[16][17].

Bowel Symptoms: When to Seek Care

Seek Emergency Care:
Go to an emergency department immediately if you experience ^[18]:

• Heavy rectal bleeding, black tarry stool, or substantial visible blood
• Fainting, severe dizziness, or marked weakness
• Severe or rapidly worsening abdominal pain
• Bloody diarrhea accompanied by a high fever
• An inability to keep fluids down (severe dehydration)

Seek Prompt Medical/Gastroenterology Care:
Schedule an evaluation with your doctor or gastroenterologist if you develop ^[18][19][20]:

• Persistent or chronic diarrhea
• Frequent abdominal pain or cramping
• Unintentional weight loss

Your doctor will likely start with a history, physical examination, and basic blood and stool tests to check for infection or inflammation before deciding if a colonoscopy is necessary.

Medication Risks and Colitis

It is crucial to have digestive symptoms evaluated because they might not be IBD; they could be an infection or a side effect of your SAPHO medications. For example, biologic medications like IL-17A inhibitors (sometimes used off-label for SAPHO) have been associated with new or worsening colitis in some people ^[21][2]. Other medications, like NSAIDs, can increase the risk of gastrointestinal bleeding or irritation.

Important: If you develop severe diarrhea or bleeding while on a biologic, do not just stop taking it on your own. Contact your prescribing doctor immediately for guidance on whether to hold your next dose and how to proceed ^[21].

Why Specialized, Coordinated Care Matters

If you develop eye or intestinal symptoms, your rheumatologist will need to collaborate closely with an ophthalmologist or a gastroenterologist ^[16][22]. Accurate diagnosis of these extra-articular (outside the joint) symptoms is critical because:

1. They require specific treatments: Treating uveitis or IBD often requires targeted therapies to prevent permanent damage, such as vision loss or severe intestinal complications ^[9][23].
2. They influence medication choices: Treatment must be highly individualized. A medication that is helpful for SAPHO bone pain might be ineffective or even harmful for IBD or uveitis ^[2][21]. Coordinating care ensures that treating one condition does not accidentally worsen another.