Slipped disc (herniated nucleus pulposus) occurred when the centre of an intervertebral disc (a jelly-like substance) is forced through the outer casing.
Tension-type headaches are a type of primary headache with no apparent cause. They cause dull pain radiating from the forehead to the neck and shoulders.
Migraine is a severe, recurring headache which may cause visual symptoms (aura). They affect 12% of people, most commonly women, who often have triggers.