Lyme Disease Abdominal Pain: Why GI Tests May Be Normal
Persistent abdominal pain may occur despite normal GI tests.
Lyme disease can disrupt autonomic pathways that regulate digestion.
Co-infections may worsen nausea, bloating, constipation, and stomach pain.
She had seen seven specialists in 18 months, but no one could explain her abdominal pain. The tests were normal. The pain was not.
Her clinicians had not initially considered that Lyme disease abdominal pain can begin long before anything appears on imaging. Ultrasound: normal. CT scan: normal. Endoscopy: normal. Colonoscopy: normal.
The final GI note read, “Likely functional. Consider stress management.” That prompted her to ask whether Lyme disease could explain her symptoms—making abdominal pain an often-overlooked Lyme disease symptom.
Why Lyme Disease Abdominal Pain Gets Missed
Abdominal pain rarely points to one diagnosis, so she was sent through standard testing to rule out ulcers, gallbladder disease, inflammatory bowel disease, or cancer.
When all of it came back normal, her pain was placed in the “functional” category—a medical way of saying, “We do not know.”
That is often where the investigation stops. But her story did not fit the pattern of a functional disorder. The timing felt wrong. The symptoms were too sudden. The rest of her body was clearly involved.
How Lyme Disease Abdominal Pain Starts
Lyme disease can affect more than the joints and nervous system. In some patients, it may also involve autonomic pathways that regulate gastrointestinal function, including signaling through the vagus nerve.
When those neural pathways misfire, digestion may slow, sensitivity may increase, and the gut may lose its usual rhythm.
Many patients also develop constipation that seems to appear suddenly. This may reflect slowed motility from autonomic dysfunction rather than a primary gastrointestinal disorder.
Some patients develop symptoms consistent with delayed gastric emptying, including early fullness, nausea, bloating, and prolonged stomach emptying. Formal testing is required to diagnose gastroparesis.
Others experience functional dyspepsia, abdominal bloating, nausea after eating, or the sense that the stomach simply will not empty. These symptoms may reflect different expressions of the same autonomic problem.
Why GI Tests May Be Normal
Traditional GI tests look for visible problems such as blockages, ulcers, inflammation, tumors, or structural changes. But Lyme disease abdominal pain may be driven by disrupted signaling rather than damage visible on a scan.
That is why the pattern can feel so confusing: migrating cramping, bloating that worsens throughout the day, nausea in waves, pain that intensifies with POTS or standing, and test after test returning normal.
This pattern is not always the same as irritable bowel syndrome that develops slowly over time. In some patients, it reflects abrupt autonomic disruption.
Co-Infections Can Complicate the Picture
Co-infections do not just add symptoms. They may amplify autonomic instability and make Lyme disease abdominal pain more intense or unpredictable.
Babesia may contribute to nausea, reduced appetite, abdominal discomfort, profound fatigue, air hunger, and night sweats. When present alongside Lyme disease, these overlapping symptoms can make the clinical picture more difficult to recognize.
When abdominal pain occurs alongside feverish episodes, sweats, dizziness, palpitations, or profound fatigue, clinicians may need to consider whether Lyme disease or tick-borne co-infections are contributing to the broader illness pattern.
When It Really Is IBS or Gastritis
Not all abdominal pain points to Lyme disease. True IBS often develops gradually, with recurring bowel pattern changes and identifiable dietary or stress triggers. Gastritis may improve with acid suppression, avoiding irritants, or treating an underlying cause.
Her case did not match either pattern. Her pain was sudden, migrating, systemic, and stubbornly unresponsive to typical GI treatments. That mismatch matters.
Treatment: What Helped
Her story changed when she recalled a tick bite six months before her symptoms began. Around that time, she also developed joint pain, dizziness, night sweats, and a racing heart when standing—clues pointing away from isolated GI disease and toward infection-driven autonomic dysfunction.
Treatment for Lyme disease and Babesia was initiated. Within three weeks, the nausea began to ease. By six weeks, the cramping episodes were fewer and less severe.
At three months, she reported, “I can finally eat a normal meal again.”
Frequently Asked Questions
Can Lyme disease cause abdominal pain?
Yes. Lyme disease may contribute to abdominal pain by affecting the autonomic nervous system and the nerve pathways that help regulate digestion. Patients may experience cramping, bloating, nausea, constipation, or gastroparesis-like symptoms even when standard GI testing is normal.
Can Lyme disease cause stomach pain?
Yes. Some patients with Lyme disease report stomach pain, nausea, bloating, early fullness, or cramping. These symptoms may reflect autonomic dysfunction, inflammation, medication effects, co-infections, or another GI condition that needs evaluation.
Can Lyme disease affect the digestive system?
Yes. Lyme disease may be associated with digestive symptoms such as stomach pain, nausea, constipation, diarrhea, bloating, abdominal cramping, and changes in motility. Other causes should also be considered, especially if symptoms are severe, persistent, or worsening.
Can Lyme disease cause constipation?
Yes. Lyme disease may contribute to constipation when autonomic dysfunction slows intestinal motility. Constipation can also result from diet, dehydration, medications, reduced activity, thyroid disease, or other medical conditions.
Can Lyme disease cause gastroparesis?
Some patients with Lyme disease develop symptoms resembling gastroparesis, including early fullness, nausea, bloating, and delayed stomach emptying. Autonomic dysfunction and vagus nerve involvement may contribute, although formal testing may be needed to confirm gastroparesis.
Why do GI tests come back normal with Lyme abdominal pain?
Standard imaging, endoscopy, and colonoscopy look for structural disease. Lyme-related abdominal pain may be neurogenic, meaning it is driven by abnormal nerve signaling or autonomic dysfunction rather than visible injury to the stomach or intestines.
How is Lyme abdominal pain different from IBS?
IBS often develops gradually with recurring bowel pattern changes and identifiable triggers. Lyme-related abdominal pain may appear suddenly, migrate, and occur with systemic symptoms such as fatigue, POTS, neuropathy, night sweats, or a history of tick exposure.
Clinical Takeaway
Lyme disease abdominal pain may be a neurologic or autonomic symptom rather than a traditional GI disorder. It can involve disrupted nerve signaling, vagus nerve pathways, altered motility, and heightened gut sensitivity.
Patients may experience cramping, bloating, nausea, constipation, gastroparesis-like symptoms, or stomach pain even when ultrasound, CT, endoscopy, and colonoscopy are normal.
When abdominal pain develops with fatigue, dizziness, brain fog, POTS, neuropathy, or a history of tick exposure—and routine GI evaluation is unrevealing—Lyme disease and other tick-borne illnesses deserve consideration.
Related Articles
These related articles explore Lyme symptoms, gut dysfunction, autonomic problems, and diagnostic challenges.
Lyme Disease Symptoms Guide
Lyme Disease Gut: Digestive Symptoms Explained
Autonomic Dysfunction in Lyme Disease
Abdominal Pain, Constipation, and Lyme Disease
POTS and Lyme Disease
Medical Dismissal in Lyme Disease
References
- Zulfiqar S, Qureshi A, Dande R, et al. The many manifestations of a single disease: neuroborreliosis. J Community Hosp Intern Med Perspect. 2021;11(1):56-59.
- Pekáčová A, Ondrová M, Barcíková E, et al. Abdominal pain as first manifestation of Lyme neuroborreliosis in children. Case Rep Orthop. 2020.
- Adler BL, et al. Dysautonomia following Lyme disease: a key component of post-treatment Lyme disease syndrome? Front Neurol. 2024.
Dr. Daniel Cameron, MD, MPH
Lyme disease clinician with over 30 years of experience and past president of ILADS.
Symptoms • Testing • Coinfections • Recovery • Pediatric • Prevention
I had violent abdominal pain, something like burning pain. Gabapentin came with an improvement in this, so it was a kind of neuropathic pain.
I am glad you found a solution. I have urged my patients to include a Lyme disease evaluation in my patients with unresolved GI issues
What treatment did you use that helped the person in this article.
Thank you
My daughter who is 8 now tested positive for Lyme at 5 years old. She was perfectly healthy before Lyme got to her. She had a limp, headache, extreme fatigue, red bullseye rashes all over, irritated eyes, a fever of 104 that wouldn’t go away for days. Her nurse practitioner for whatever reason didn’t think it was lyme. So for 3 weeks she had these symptoms before I finally brought her to urgent care. They immediately diagnosed her with Lyme and sent her home with 3 weeks of doxycycline and two weeks of amoxicillin. That seemed to kick the limping, fever and excessive fatigue. She has been struggling with poor digestion and big stools and urinary urgency ever since. She now can’t digest milk products and she doesn’t eat big meals anymore. She always feels full. Her teeth don’t look healthy even though she brushes every day. Her hair is thin as well. I feel like she is not absorbing enough nutrients. I don’t know who to take her to see because her nurse practitioner denies that she had it even though she tested positive for it. She even called me and told me she tested positive for it but says it was most likely a false positive. I just want to see my daughter thrive. We need help from a real doctor who won’t gaslight us. We do not have lots of money to bring her to get tested everywhere. This article really sounds like what she has been dealing with. If you have any suggestions I am all ears! Thank you for your time
One of my first Lyme symptoms over 30 years ago was stomach pain and then POTS. Treated on and off for many years and generally much better except for the stomach issues listed above. Two years ago My heart eould race everytime I swallowed and only lasted maybe 15 seconds. Stayed in hospital two nights and everything was pretty normal…. All tests. I told the docs it was probably my vagus nerve and they thought it plausible. Recently bloating and what felt like gastroparesis led me to get tested at IGENEX and test came back with IGM positive for babesia and indeterminant for TBRF. So im waiting for atovaquone and arithromycin to come. Ive read that babesia can also cause these symptoms so we will see. Its kind of a relief to hear that it could be lyme/coinfection related
Thanks for sharing. I have patients with POTS and GI issues from autonomic Lyme
Pareil pour moi piqûre avec érythème migrant rester sans traitement pendant un mois mon généraliste ne voyait pas ce que j’avais je me suis présenté aux urgences et là un interne m’a dit faut faire une sérologie et bien sûr j’étais positive plus plus et depuis j’ai reçu deux fois un mois amoxicilline et rien d’autre mais toujours pas soigner j’ai toujours des symptômes qui migre mais les médecins ne nous écoute pas voilà
I am sorry to hear that you are still ill. You are welcome to call my office with your question.
Thank you for posting this. This was my experience exactly! Sudden issues with constipation that didn’t follow normal advice (drink more water, eat more fiber, etc). Tests all came back normal. I had a hard time getting providers to listen to me or take me seriously. The gastrointestinal symptoms were preceded by noticeable psychiatric changes for about a year (big increase in anxiety, less feeling of being grounded, more negative self-talk). No bullseye rash or acute illness. It took me 23 years to get diagnosed. Treating now and finally getting some relief.
Interesting article. I contracted some form of lyme and babesia and other coinfections. First in Germany in 1995 and some probably later. Regardless of where I lived my life changed 100% as even the Mayo clinic, pain clinics, Univ…. long story short, GI has always been a problem. Try every option i learn of. In 2019 i went to a clinic in Germany and finally learned the truth. Read and followed lyme dr’s and read Buhner and others recommendations.
Takes work to try to be healthy but more so to deal with humans who don’t believe nor understand. Best is to read, try, love animals, exercise, and eat carefully. Bikram hot yoga! Any GI advice welcomed. Even good food can leave one feeling miserable.