Can Allergies Make You Tired?

Feeling tired is not usually the first symptom people think of when they hear the word allergies. Sneezing, itchy eyes, congestion and a runny nose are much more obvious. But allergies can also leave you feeling drained, unfocused and low on energy.

Here is why that can happen.

Allergies Can Disrupt Your Sleep

A blocked or runny nose can make it harder to breathe comfortably at night. You may wake up often, breathe through your mouth or have trouble getting deep, restful sleep.

Even if you spend eight hours in bed, the quality of your sleep may be poor. The next day, you may feel tired, irritable or unable to concentrate.

Children with nasal allergies may also sleep poorly. Parents may notice snoring, mouth breathing, daytime tiredness or difficulty focusing at school.

Your Body Is Responding to an Allergen

An allergic reaction happens when the immune system reacts to something that is usually harmless, such as pollen, dust mites, pet dander or mould.

This response can cause inflammation in the nose, eyes and airways. Dealing with ongoing symptoms can make your body feel worn down, especially when the exposure continues for days or weeks.

Some Allergy Medicines Can Cause Drowsiness

Certain antihistamines can make some people sleepy. This is more common with older antihistamines, but everyone responds differently.

If you feel unusually tired after taking an allergy medicine, speak with your doctor or pharmacist. Do not stop or change a medication without checking first. They may be able to suggest another option that is less likely to cause drowsiness.

Signs Your Tiredness May Be Related to Allergies

Allergies may be contributing to your fatigue if you also have:

• Sneezing
• A stuffy or runny nose
• Itchy or watery eyes
• An itchy nose or throat
• Post-nasal drip
• Symptoms that worsen around pets, dust, pollen or mould
• Symptoms that return during the same season each year
• Poor sleep caused by congestion

Allergies usually do not cause a fever. A fever, strong body aches or feeling suddenly very unwell may point to an infection or another cause.

What Can Help?

The best approach depends on what is triggering your symptoms. Simple steps may include:

• Keeping windows closed when pollen levels are high
• Showering and changing clothes after spending time outdoors
• Washing bedding regularly
• Reducing dust and indoor allergens
• Keeping pets out of the bedroom if pet dander is a trigger
• Following the treatment plan recommended by your healthcare provider

If symptoms continue, allergy testing may help identify your triggers. An allergist can then recommend a treatment plan based on your symptoms, health and test results.

When Should You Speak With a Doctor?

Tiredness can have many causes, including poor sleep, stress, anemia, thyroid problems, infections and other health conditions. It is important not to assume that allergies are always responsible.

Speak with a healthcare provider if your fatigue is severe, continues for a long time, affects your daily life or happens without clear allergy symptoms.

If you have ongoing sneezing, congestion, itchy eyes or other possible allergy symptoms, Dandelion Allergy Centre can help identify the cause and discuss treatment options.

We assess adults and children at our Mississauga, Milton and North York locations. Patients with a valid OHIP card require a referral. Ask your family doctor or walk-in clinic to send us a referral.

This article provides general information and is not a substitute for individual medical advice.