SIBO Symptoms: How to Recognize the Warning Signs Early

Recognizing the early signs of Small Intestinal Bacterial Overgrowth (SIBO) can make a big difference in getting the right treatment sooner. Because symptoms often overlap with other gut issues, knowing what to watch for helps you take the right next step.

What Is SIBO?

SIBO occurs when bacteria that normally belong in the large intestine start overgrowing in the small intestine. This imbalance interferes with digestion and nutrient absorption, often leading to gas, bloating, and other digestive and systemic issues.

Core Gastrointestinal Symptoms

SIBO’s hallmark signs often show up in the digestive tract:

• Bloating & distension – noticeable abdominal swelling, often worse after meals or later in the day.
• Excessive gas & belching – frequent burping, flatulence, or sensations of trapped gas.
• Bowel changes – diarrhea, constipation, or alternating patterns.
  • Methane-dominant SIBO → more constipation.
  • Hydrogen-dominant SIBO → more diarrhea.
• Abdominal discomfort – cramping, aching, or post-meal pain that may improve after a bowel movement.

Non-Digestive Symptoms

SIBO can also affect your overall health beyond the gut:

• Fatigue & brain fog – tiredness, low energy, and difficulty concentrating.
• Nutrient deficiencies – especially vitamin B12 and iron, leading to anemia or weakness.
• Skin issues – acne, eczema, or unexplained rashes.
• Mood changes – anxiety, irritability, or low mood linked to gut-brain connection.

SIBO vs. IBS and Other Gut Conditions

SIBO symptoms can mimic Irritable Bowel Syndrome (IBS), but some patterns make SIBO more likely:

• Strong post-meal bloating that worsens as the day goes on.
• Temporary improvement with antibiotics or herbal antimicrobials.
• Unexplained nutrient deficiencies (like low B12 or iron).
• History of abdominal surgery, motility disorders, or conditions that slow digestion.

Who Is at Risk?

Several factors increase the likelihood of SIBO:

• Slowed gut motility (nerve or muscle issues, diabetes, etc.)
• Structural gut changes (surgery, strictures, adhesions)
• Long-term use of proton pump inhibitors (PPIs)
• Repeated antibiotic use
• Underlying conditions such as celiac disease, IBD, or scleroderma

What To Do If You Suspect SIBO

If these symptoms sound familiar, here are your next steps:

1. Track your symptoms – note bloating patterns, bowel changes, and fatigue.
2. Seek professional evaluation – see a gastroenterologist or naturopathic doctor familiar with SIBO.
3. Testing – breath tests (lactulose or glucose) can detect hydrogen or methane overgrowth.
4. Symptom relief – short-term dietary changes (low-FODMAP or reduced fermentables) may help temporarily.
5. Address the root cause – treatment often combines antimicrobials (herbal or prescription), motility support, and diet guidance.

Key Takeaway

SIBO can cause both digestive and whole-body symptoms — from bloating and gas to fatigue and nutrient deficiencies. If you notice these signs, don’t ignore them. The sooner you get tested and treated, the better your long-term gut health and quality of life will be.

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If you think you may have SIBO, schedule a consultation with Dr. Alaina Goesling to explore testing and treatment options.

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