What causes sinus headaches?
A sinus inflammation, also known as Sinusitis can be triggered by a viral infection. However, it can also be caused by an allergic reaction like hay fever for example. Let’s clear something up though, hay fever has nothing to do with hay. It’s technically a case of Allergic Rhinitis—just a fancy medical term for inflammation of the nose.
The inflammation causes swelling and increased mucus production as the sinus attempts to flush itself out. However, due to the blockage mentioned above—drainage becomes impossible or very restricted. The combination of inflammation and excess fluid without drainage puts significant pressure on the sinuses and causes the headache as discussed.