I have a severe headache on one side , nor always

Hello. Thank you for writing.

Headaches can cause a dull throbbing or an intense ache and pain in different areas, including the right side of your scalp, the base of your skull, and your neck, teeth, or eyes.  A tension headache may cause pain on the left side and behind the eyes, and may be linked to stress. Cluster headaches, which affect men more often than women, are recurring headaches that occur in groups or cycles. The headaches appear suddenly and are characterized by severe, debilitating pain on one side of the head often accompanied by a watery eye and nasal congestion or a runny nose on the same side of the face.  We cannot know what is causing your headaches. Your doctor can tell you more.

Helena