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Gut Health Focus

Bacterial Overgrowth: 3 Signs You Can't Ignore

September 5, 2026
2 min read
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Bacterial Overgrowth: 3 Signs You Can't Ignore
Bacterial overgrowth causes bloating, fatigue, and poor digestion. See the 3 signs you shouldn't ignore, and when to seek help.

3 Signs of Bacterial Overgrowth You Can't Ignore!

Do you feel constant abdominal discomfort and extreme fatigue and don't know why? These could be signs of small intestinal bacterial overgrowth (SIBO), a condition that affects gut health and the absorption of essential nutrients. Don't ignore the signs — your body may be asking for help!

SIBO happens when there's excessive bacterial growth in the small intestine, an area that normally has less bacterial presence. This imbalance can be caused by several factors, such as impaired intestinal motility, excessive antibiotic use, gastrointestinal surgery, and conditions like diabetes or autoimmune diseases.

1. Physical and Mental Fatigue

Bacterial overgrowth happens in the small intestine, the main site of nutrient absorption. When there's an imbalance, the body doesn't properly absorb vitamins and minerals, resulting in:

  • Constant fatigue
  • Mental exhaustion
  • Difficulty concentrating
  • Decline in physical and cognitive performance

If you feel like you're always drained, even after a good night's sleep, it's time to investigate your gut health.

2. Unexplained Weight Loss

Unexplained weight loss is common in people with SIBO, especially due to frequent diarrhea flare-ups and poor absorption of essential nutrients.

Beyond weight loss, bacterial overgrowth can lead to serious nutritional deficiencies, such as low iron, B-complex vitamins, vitamin D, and other important micronutrients. These deficiencies can cause anemia, a weakened immune system, and increased susceptibility to infections.

3. Digestive Difficulty

One of the causes of SIBO is hypochlorhydria, low stomach acid production. When it's reduced, unwanted bacteria can more easily reach the small intestine, causing:

  • Abdominal bloating after meals
  • Excess gas
  • Persistent abdominal discomfort
  • Pain and a bloated feeling even after eating very little

You Need a Specialized Nutritionist

Nutritional support is essential to identify foods that cause discomfort and adapt your diet to promote balance in your gut microbiota. A nutritionist will build a personalized meal plan focused on reducing symptoms and restoring gut health.

Combining probiotics and prebiotics can help restore the balance of your gut flora, bringing lasting symptom relief.

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Bruna Barbosa

About the Author

Bruna Barbosa — Nutritionist, CRN-DF 16963

Specializing in Functional Nutrition, Phytotherapy, and Digestive Health, Bruna helps people understand their symptoms and transform their health starting from the gut, based on scientific evidence, empathy, and clinical practice. She produces accessible, well-founded content to guide more conscious and sustainable choices.

Learn more about Bruna →