What is SIBO?

The Missing Link Behind Bloating, Food Reactions, and “Unexplained” Gut Issues

If you feel like your body reacts to everything you eat…If you’re bloated no matter how “clean” your diet is…If you’ve been given multiple diagnoses but still don’t feel better…

There’s a strong chance something deeper is being missed. One of the most overlooked root causes I see in practice is SIBO: Small Intestinal Bacterial Overgrowth.

What SIBO Actually Is

SIBO occurs when bacteria that are normally supposed to live in the large intestine overgrow in the small intestine, where they do not belong in large amounts.

The small intestine is designed for nutrient absorption, enzyme activity, and controlled, low levels of bacteria. When bacteria overgrow in this space, they begin to ferment your food too early, produce gas in the wrong location, disrupt digestion and absorption, and trigger inflammation and immune responses. This is why many patients say the same thing, “I’m eating healthy, but my body is reacting like I’m not.”

The Three Types of SIBO

Not all SIBO is the same. Understanding the type is key to understanding your symptoms.

1. Hydrogen-Dominant SIBO

This is the most common form. In this type, bacteria produce hydrogen gas as they ferment carbohydrates. This type tends to move things too quickly through the gut.

Common symptoms:

• Bloating (especially after meals)

• Loose stools or diarrhea

• Urgency after eating

• Cramping

• Food sensitivities (especially carbs, fiber, or sugar)

• Fatigue after meals

2. Methane-Dominant SIBO (IMO)

Technically called Intestinal Methanogen Overgrowth (IMO), this involves methane-producing microbes. Methane slows down gut motility, which creates a cycle: slow gut → more overgrowth → even slower gut

Common symptoms:

• Constipation (very common)

• Hard or infrequent stools

• Bloating that feels “stuck”

• Weight gain or difficulty losing weight

• Sluggish digestion

• Brain fog

3. Hydrogen Sulfide SIBO

This is the most overlooked and often the most frustrating. These bacteria produce hydrogen sulfide gas.This type is often missed on standard testing.

Common symptoms:

• Bloating + pressure

• Diarrhea or alternating bowel patterns

• Burning sensation in gut

• Strong-smelling gas (rotten egg smell)

• Histamine reactions

• Sensitivity to sulfur foods (eggs, garlic, onions)

• Fatigue and “toxic” feeling

How to Identify Which Type You Likely Have

If you lean diarrhea + urgency: likely hydrogen-dominant

If you struggle with constipation + slow digestion: likely methane-dominant

If you have weird reactions, sulfur sensitivity, or “nothing works”: likely hydrogen sulfide

If you feel bloated after almost every meal, worse even with healthy foods (vegetables, fiber, probiotics) and feel better when you eat less...that’s a major SIBO red flag.

Conditions Commonly Associated with SIBO

SIBO rarely exists alone. It is usually part of a bigger picture. SIBO often sits at the center of these patterns because it disrupts absorption, increases inflammation, and slows proper gut function.

Digestive Diagnoses

• IBS (especially IBS-D or IBS-C)

• Acid reflux / GERD

• Chronic bloating

• “Leaky gut”

• Food sensitivities

Autoimmune Conditions

• Hashimoto’s thyroiditis

• Celiac disease

• Rheumatoid arthritis

Hormonal & Metabolic Issues

• Thyroid dysfunction (especially hypothyroidism)

• Estrogen imbalance

• Insulin resistance

Nervous System & Motility Issues

• Dysautonomia / POTS-like symptoms

• Chronic stress

• Vagus nerve dysfunction

Nutrient Deficiencies

• Low iron / ferritin

• Low B12

• Low magnesium

• Poor fat-soluble vitamin absorption

The Diagnoses That Keep You Stuck

One of the biggest problems with SIBO is that it is often misdiagnosed or masked.

You may have been told you have:

• IBS

• Acid reflux

• Food intolerances

• Anxiety-related gut issues

• “Just stress”

• Hormonal imbalance

And while those may be partially true…they often don’t address the root cause.

Why This Keeps You in a Loop

Most conventional treatments focus on symptom suppression with acid blockers for reflux, fiber for constipation, anti-diarrheal medications, and elimination diets. These may provide temporary relief, but they do not address bacterial overgrowth, motility dysfunction, and any underlying immune imbalance. So what happens? You feel slightly better. But then symptoms return leading you to you restrict more foods which reults in your system becoming even more reactive. This is the cycle I see over and over:

manage → relapse → restrict → worsen → repeat.

Why SIBO Is Often Missed

SIBO is commonly overlooked because symptoms overlap with many other conditions, testing is imperfect, and root causes (motility, nervous system, thyroid) are rarely addressed

Yes, SIBO is a gut issue but more importantly to pay attention to, it is a sign that something deeper is of with gut motility, nervous system regulation, immune balance, thyroid function, and digestive capacity. This is why true healing requires more than just killing bacteria, taking probiotics, and removing foods. It requires restoring the system as a whole.

What to do

If you feel like your body is reacting to everything, you’re constantly bloated or uncomfortable, and you’ve been given multiple diagnoses but no real answers…

SIBO may be the missing piece and specific protocols exist that you can put in place.

Learn more...