Have you ever eaten something you thought was healthy, like a spinach salad with avocado, and then found yourself feeling itchy, foggy, or just not quite right? Maybe wine leaves your nose stuffy, or you suddenly feel anxious and can’t quite explain why. There can be a few reasons for these reactions, and histamine is one possibility.

So, What is Histamine Anyways?

Histamine is a chemical your body makes naturally. You might know it for its role in allergic reactions, like when pollen makes your eyes itchy or your nose run. But histamine does more than that. It also helps regulate stomach acid and plays a role in digestion. Your body needs histamine to do these jobs. Problems can arise when histamine triggers symptoms or your body has difficulty breaking it down. In some people, this may contribute to symptoms such as itching, headaches or digestive discomfort.

The Bucket Metaphor

I sometimes think of it like a bucket. Different things, including certain foods, stress, and hormonal changes, may affect how we feel. Foods like aged cheese and wine can contain high levels of histamine, although the amount can vary.

For a long time, I thought headaches and a stuffy nose were just random things that happened to me. It can be frustrating when you can’t figure out what’s behind a symptom, especially when it doesn’t seem to happen every time you eat the same food. With histamine, reactions can vary from person to person, and it isn’t always easy to pinpoint a trigger. Looking at the bigger picture may help you notice patterns, rather than blaming the last thing you ate.

Signs Your Bucket Might Be Overflowing

The tricky thing is that histamine symptoms can look like a lot of other things. You might not even realize what’s going on. Some common signs:

• Runny or stuffy nose even when you’re not sick
• Headaches or migraines
• Skin issues like hives, rashes, or itching
• Sneezing or watery eyes
• Bloating, cramping, or nausea after eating
• Feeling anxious or wired for no obvious reason
• Swelling especially around the face, lips, or eyes
• Dizziness or lightheadedness
• Fatigue especially after meals
• PMS-like symptoms or menstrual irregularities
• Flushing or feeling hot after certain foods or drinks

Histamine-related symptoms can be tricky to figure out because they often overlap with other conditions. They also aren’t usually picked up by standard allergy tests, which look for different types of allergic reactions. You might notice symptoms come and go without an obvious reason. If you’re trying to work out what’s behind them, keeping track of what you eat, how you sleep, your stress levels, and how you feel may help you spot a pattern over time. It won’t give you all the answers, but it can be a useful place to start.

So Why Does This Happen?

Everyone’s experience is a little different but here are the most common reasons:

• Too many high histamine foods — aged cheese, smoked meats, wine, fermented foods, leftovers, tomatoes, spinach. Eating a lot of these regularly can tip the balance.
• Low DAO enzyme — DAO is what breaks down histamine in the gut. If your levels are low (which can happen with gut issues, certain medications, or just genetics) histamine builds up faster than your body can clear it.
• Gut imbalance — a leaky gut, bacterial overgrowth, or other digestive issues can affect how your body processes histamine.
• Hormones and stress — estrogen can actually increase histamine, which is why some women notice worse symptoms around their cycle. And stress throws everything off too.

How Do You Figure Out If Histamine Is the Problem?

There’s no perfect test but here’s what actually helps:

• Track your symptoms — write down what you eat, how you feel, and when things flare. Patterns start to emerge faster than you’d think.
• Try a low histamine reset — not forever, just two to four weeks. If symptoms improve, histamine is likely part of your puzzle.
• Work with a practitioner — they can help with testing, enzyme supplements, and gut healing in a way that actually fits your situation.

What Can You Do to Feel Better?

• Cut back on high histamine foods for now — aged cheese, processed meats, vinegars, wine, chocolate, fermented foods, leftovers, citrus, canned fish. Fresh and simple is your best friend right now.
• Support your gut — bone broth, cooked vegetables, gentle fibre. If you’re adding probiotics just be careful — not all of them are histamine friendly.
• Reduce stress where you can — deep breathing, gentle walks, saying no occasionally. It all counts and it genuinely affects your histamine load.
• Watch your medications and supplements — some NSAIDs, certain antibiotics, and antidepressants can block DAO or trigger histamine release. Worth a conversation with your doctor if you’re unsure.
• Don’t panic — please don’t feel like you need to be afraid of food forever. Most people find that once their system calms down they can slowly reintroduce a lot of what they cut out.

I used to wonder why I could eat something one day and feel fine, then have a reaction to the same food another time. It took some time and a process of eliminating and reintroducing foods for me to start noticing patterns. I still can’t explain every reaction, but I’ve become more familiar with how I feel when symptoms start showing up. That’s when I take a closer look at what I’ve been eating and how I’ve been feeling lately, including my sleep and stress levels.

Simply Salt & Soul

The Salt (The Science): If you’re looking into histamine as a possible trigger, leftovers are something to keep in mind. Histamine can form as bacteria grow in food, and once it’s there, cooking won’t get rid of it. Freezing leftovers soon after cooking can help slow further histamine formation, rather than leaving them in the fridge for several days. It’s a practical food-storage habit, especially if you’ve noticed that certain leftovers seem to bother you.

The Soul (The Wellness): Sometimes, what you’re eating is only part of the picture. Stress and poor sleep can affect how you feel, too, and they can make existing symptoms harder to manage.

I’ve noticed this with my own symptoms. Some of my worst flare-ups happened during stressful weeks when I wasn’t getting enough rest. I couldn’t always point to a particular food that had caused them. Looking back, I think everything else going on in my life may have played a part, too. That’s why I try to look at more than just my diet when I’m not feeling well. What have my sleep and stress levels been like lately? Have I been pushing myself too hard? Sometimes those questions tell me just as much as looking at what I’ve been eating.