Did you know that hay fever and seasonal allergies may sometimes aggravate IBS-type symptoms, skin flare-ups and digestive sensitivity?
This is something I have been noticing in clinic over the years. Around hay fever season, more clients seem to report bloating, gas, abdominal discomfort, irregular bowel habits, food reactions or skin flare-ups. At first, the connection may not seem obvious. Hay fever is usually associated with itchy eyes, sneezing, a blocked or runny nose, sinus irritation, rhinitis, itchy skin or eczema.
But after seeing this pattern again and again, I started looking more closely at what could be happening. Could seasonal allergy activity be making the gut more reactive? Could histamine release be aggravating gut sensitivity? And could this explain why some people feel their IBS symptoms become worse during pollen season?
The connection starts to make sense when we look at the immune system. Hay fever involves immune activity, and one of the main chemicals involved in allergic reactions is histamine.
During pollen season, allergens can trigger immune cells, including mast cells, to release histamine and other inflammatory chemicals. This is what contributes to the familiar allergy symptoms in the eyes, nose, throat and skin. But mast cells are also found throughout the gut, close to the lining of the digestive tract and the nerves that influence gut sensitivity.
This is where the connection with IBS becomes interesting.
IBS is often linked with visceral hypersensitivity. In simple terms, this means the gut can become more sensitive to normal sensations such as gas, stretching, certain foods, bowel movements, stress or hormonal changes. Things that may not bother one person can cause bloating, cramps, urgency, diarrhoea, constipation or abdominal discomfort in someone with IBS-type symptoms.
So, if the immune system is already more activated during hay fever season, and histamine levels are increased, it makes sense that the gut may also feel more reactive in some people.
This does not mean hay fever causes IBS. IBS is complex. It can involve the gut-brain axis, stress, the microbiome, previous infections, food sensitivities, hormones, inflammation, nervous system sensitivity and immune activity.
However, what I do see clinically is that some people’s IBS-type symptoms appear to flare during pollen season. This can happen even when their hay fever symptoms are mild. They may not have dramatic sneezing or streaming eyes, but they notice more bloating, cramping, food reactions, loose stools, constipation or abdominal discomfort.
Histamine may also help explain why some people notice both digestive symptoms and skin flare-ups at the same time. When the body is already dealing with seasonal allergens, the gut lining, immune system and skin may all become more reactive. This is also why food intolerances, histamine-rich foods, stress and poor sleep can sometimes make symptoms feel worse.
This is not about blaming one single trigger. It is about paying attention to patterns.
Do your IBS symptoms flare during spring or early summer? Do you notice more bloating, gas, food reactions or skin irritation when your hay fever is worse? Do certain foods feel harder to tolerate during pollen season?
These observations can be very useful.
At NATPATH, we support IBS-type symptoms with colon hydrotherapy, naturopathic nutrition, food intolerance testing, abdominal massage and practical digestive health guidance. During IBS Awareness Month, we will also be sharing more blogs, vlogs, recipes and tips to help you better understand your gut and the different factors that may influence it.
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