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Why do I have a headache, days after an allergic reaction?

Headaches can be caused by a number on things, a couple of which may be stress and sinus congestion. Seasonal allergies can cause nasal congestion. Generalized allergic reactions can cause a stress reaction, which can lead to headaches. These headaches do not always represent sinus infections and can be normal. These usually resolve with relief of the allergy symptoms.

Continue Learning about Allergies

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.