If you suspect gluten sensitivity, it’s important to get properly tested before eliminating gluten, as testing requires you to be consuming gluten.

10 Warning Signs You May Be Sensitive to Gluten

1. Digestive Issues

This is the most well-known category, and for good reason.

What to notice:

  • Frequent bloating and gas after meals

  • Diarrhea or constipation (or alternating between them)

  • Abdominal pain or cramping

  • Nausea after eating

  • Greasy, foul-smelling stools (indicates poor fat absorption)

Why it happens: In sensitive individuals, gluten can trigger inflammation in the gut lining, disrupting normal digestion and nutrient absorption.

2. Brain Fog and Difficulty Concentrating

Many people with gluten sensitivity report feeling like they’re thinking through molasses.

What to notice:

  • Difficulty focusing on tasks

  • Forgetfulness

  • Feeling mentally “slow” or foggy

  • Trouble finding words

Why it happens: The gut-brain connection is real. Inflammation in the gut can affect cognitive function, and some researchers believe gluten peptides can cross the blood-brain barrier in sensitive individuals.

3. Fatigue and Low Energy

Feeling tired after a gluten-containing meal is a common red flag.