When you think of the flu, you might picture a fever, body aches, chills, and a persistent cough. However, influenza can cause a variety of symptoms that do not always fit the typical picture of the illness. One example is pressure in your head, even when your nose feels completely clear. If you’re experiencing a heavy, tight, or full sensation around your forehead, temples, or behind your eyes without noticeable nasal congestion, you may ...