Severe pain in the head, behind the eyes or ears, is usually caused due to sinusitis. Among the various types of sinusitis, sphenoid sinusitis can cause intense headaches, specially behind the eyes.Whereas, frontal and ethmoid sinusitis can cause severe pain in the head, behind the ears or eyes.evere pain in the head, behind the eyes or ears, is usually caused due to sinusitis. Among the various types of sinusitis, sphenoid sinusitis can cause intense headaches, specially behind the eyes.