Allergies happen when your immune system has a strong reaction to a substance that shouldn't normally cause a reaction. These substances are called allergens.
In most cases, allergens simply cause unpleasant symptoms such as:
expectoration
scratching
sneezing
skin irritation
runny nose (blood)
Fortunately, most people with allergies have only mild discomfort. But many also complain of feeling tired. Can allergies make you sleepy?
How do allergies cause fatigue?
Yes, allergies can make you feel tired. Most people with a stuffy nose and head caused by allergies will have some trouble sleeping. But allergic reactions can also release chemicals that make you feel tired. These chemicals help fight your allergies, but they also cause swelling of the nasal tissues that can make your symptoms worse. Lack of sleep and constant nasal congestion can leave you feeling groggy and tired.
Experts call this fatigue caused by allergies a "brain fog." Brain fog can make it difficult to concentrate and perform school, work, and daily activities.
