Signs of a Leaky Gut
See the Symptoms

Connect the Dots

If you’re trying to work out whether the signs of a leaky gut match what you’ve been experiencing, you’re not alone, and you’re not overthinking it. Here are the common and less obvious signs of a leaky gut, why they often get missed or dismissed, how they connect to your wider health, and a sensible next step once you recognise several of them in yourself.

As a nutritional therapist working in root-cause, functional medicine, I spend a lot of my time helping people join the dots between symptoms that, on the surface, don’t seem connected at all, and I want to help others be able to recognise when to get help.

Common Signs of a Leaky Gut

Some signs of a leaky gut are fairly well known, even if the underlying cause isn’t always obvious.

Bloating after meals, irregular bowel habits, excess wind, discomfort after eating certain foods, and reactions to foods that never used to bother you are all common starting points. On their own, any one of these could have several explanations, which is exactly why I look at the whole pattern rather than a single symptom when someone comes to me with concerns like these, and why I’d rather spend time understanding your full picture than react to one symptom in isolation.

It’s also worth saying that these signs don’t need to be severe to be worth investigating; persistent, low-grade discomfort counts just as much as anything more dramatic.

Why These Signs Get Dismissed

A lot of people I work with have already been told their bloods are “normal”, or that what they’re feeling is just stress. Standard testing is designed to rule out specific, serious conditions, and it does that well, which is exactly why it’s an important first step, but it isn’t built to pick up the more subtle picture of gut and immune imbalance that functional medicine looks at.

If you’ve been dismissed before, it doesn’t mean nothing is going on; it usually means the right kind of assessment hasn’t happened yet, and that’s precisely the gap I work in. Taking these signs seriously, rather than filing them under “just one of those things”, is where the useful work actually starts. We would typically start off with advanced lab testing, which is a way of testing for leaky gut that goes beyond the standard GP blood tests.

Signs Worth Investigating

No fixed checklist confirms anything on its own, and I’d be cautious of any page that tells you otherwise. Generally, the more of these signs you’re noticing together, and the longer they’ve been building, the more worth investigating your gut health becomes.

A single symptom that comes and goes, like the occasional bout of bloating after a heavy meal, might well have a simple explanation and nothing more sinister behind it. Several signs of a leaky gut showing up at once, particularly alongside fatigue, skin changes, or joint discomfort, are usually a stronger signal that it’s worth a conversation rather than waiting to see if things settle on their own, especially if you’ve noticed the pattern building over months rather than days.

Wider Health

It’s worth understanding why these signs so often cluster together rather than showing up alone. A gut lining that’s more permeable than it should be tends to keep your immune system on higher alert, and an immune system working overtime can show up as skin flare-ups, joint discomfort, low energy, and even shifts in hormonal wellbeing, since your gut, immune system, and hormones are far more interconnected than most generic health content suggests.

This is exactly why I look at gut health, immune health, and hormonal wellbeing together rather than viewing them as three separate problems, and it’s often the missing link for people who’ve been managing each symptom individually without much progress.