I have been having pricking headache only on one side always (left-hand side). The pain always starts from forehead circling left eye and spreads to entire left part of the upper head. Sometimes affecting the left ear part as well. After the pain its some sort of heaviness or numbness in head. Very rarely the pain spreads to the right else its always on the left side. what can be the cause for this pain. Please help. Regards Ranjini