Allergies make you feel sick because your immune system overreacts to harmless substances, triggering inflammation and releasing chemicals like histamine that cause fatigue, nausea, and other flu-like symptoms.
When you encounter an allergen (like pollen or pet dander), your immune system mistakenly identifies it as a threat. This triggers the release of histamine and other chemicals, which cause inflammation and various symptoms. The resulting congestion, fatigue, and malaise mimic a viral infection, making you feel generally unwell.
Allergy symptoms often overlap with those of a cold or flu, leading to confusion. Here are the most common symptoms that contribute to feeling sick:
Allergies and illnesses like the common cold share many symptoms, such as runny nose, sneezing, and fatigue. However, allergies are caused by an immune response to environmental triggers, while colds and flu are caused by viruses. Unlike colds, allergies don't go away on their own-they persist as long as you're exposed to the allergen.
One key difference is duration. A cold typically lasts 7-10 days, while allergies can linger for weeks or months, depending on exposure. Another distinction is that allergies often cause itchy eyes and throat, whereas colds do not.
To reduce allergy symptoms and improve how you feel, consider these strategies:
Last spring, I noticed that my allergies left me feeling exhausted and achy for days. After taking an antihistamine and using a saline nasal rinse, my symptoms improved. Reducing exposure to pollen by staying indoors on high-count days also helped.