What is the primary reason that sinuses can cause headaches?

The primary reason that sinuses can cause headaches is due to pressure and inflammation. When the mucous membranes lining the sinuses become inflamed, which is often a result of infection, allergies, or irritants, this inflammation leads to swelling that narrows or blocks the sinus passages. As the sinuses become congested with mucus, pressure builds within the sinus cavities. This increased pressure can trigger pain in surrounding areas, leading to headache symptoms.

Additionally, the inflammation can irritate nearby nerves, further contributing to the headache sensation. This process is commonly seen in conditions such as sinusitis, where the inflammation is pronounced and the associated pressure can result in significant discomfort and pain in the forehead, cheeks, and around the eyes. Understanding this dynamic is critical for recognizing how sinus issues directly correlate with headaches.