What Are the Symptoms of SIBO? A Complete Guide for Those Who Suspect It (or Are Just Curious)

Small Intestinal Bacterial Overgrowth (SIBO) happens when there is an abnormal increase of bacteria in the small intestine. This causes improper fermentation of food — especially carbohydrates — leading to digestive (and sometimes non-digestive) symptoms that are often confused with other conditions.

This article is written both for people who suspect they have SIBO and for those who are simply curious about unexplained digestive issues.

Most Common Symptoms of SIBO

1. Persistent Bloating

This is the hallmark symptom.

• Feeling swollen after meals

• Visible abdominal distension

• Bloating that worsens throughout the day
  

Many people say: “I wake up flat, but by evening I look pregnant.”

2. Excessive Gas

When bacteria ferment carbohydrates, they produce gases like hydrogen and methane.

This can cause:

• Frequent flatulence

• Burping

• Internal pressure

• Loud stomach noises
  
  

3. Abdominal Pain or Discomfort

It’s not always sharp pain. It may feel like:

• Pressure

• Mild burning

• Cramping

• A strange “movement” sensation inside
  
  

4. Diarrhea, Constipation… or Both

SIBO can show up differently depending on the dominant gas:

• Hydrogen-dominant SIBO: more commonly linked to diarrhea

• Methane-dominant SIBO: often associated with constipation

• Some people alternate between both
  

If you were diagnosed with IBS but never fully improved, it may be worth looking deeper.

5. Food Intolerances

Common triggers include:

• Garlic

• Onion

• Wheat

• Dairy

• Legumes

• High-FODMAP fruits
  

If your list of “safe foods” keeps shrinking, bacterial overgrowth may be part of the problem.

Less Known Symptoms of SIBO

This is where many people get surprised.

6. Chronic Fatigue

Poor nutrient absorption may lead to:

• Constant tiredness

• Low energy

• Brain fog
  
  

7. Nutrient Deficiencies

SIBO can interfere with the absorption of:

• Vitamin B12

• Iron

• Magnesium

• Fat-soluble vitamins
  

This may result in hair loss, weak nails, or general weakness.

8. Skin Issues

Some individuals report:

• Rosacea

• Acne

• Eczema
  

The gut-skin connection is stronger than most people realize.

9. Acid Reflux or Persistent Heartburn

Even though it may sound unrelated, SIBO can be associated with:

• Acid reflux

• Burning sensation in the throat

• Frequent burping after meals
  
  

Do These Symptoms Automatically Mean You Have SIBO?

Not necessarily.

Many digestive disorders share similar symptoms:

• Irritable Bowel Syndrome (IBS)

• Food intolerances

• Celiac disease

• General gut dysbiosis
  
  

SIBO is usually diagnosed through a breath test that measures hydrogen and methane levels after ingesting lactulose or glucose.

When Should You Suspect SIBO?

You might consider it if:

• You experience daily bloating

• Symptoms worsen after eating

• You’ve been told it’s “just stress,” but nothing improves

• You’ve tried multiple diets without long-term relief

The solution isn’t just removing foods. It’s understanding what’s happening inside your small intestine.

Important: SIBO Is More Than “Just Gas”

It’s often a signal that something is off with gut motility, digestion, or microbial balance. And the good news? It can be addressed. With proper testing, guided treatment, and strategic dietary changes, many people significantly improve their quality of life.

If you recognized yourself in several of these symptoms, you’re not imagining it. Your body is communicating. Whether you have confirmed SIBO or are simply researching unexplained digestive discomfort, education is your first step toward healing. If you want to learn more about low-FODMAP strategies, SIBO-friendly recipes, and practical gut health guidance, visit our website and explore our resources.

#SIBO #GutHealth #DigestiveHealth #LowFODMAP