​Stress is a factor in

A) ​tension but not vascular headaches.
B) ​vascular but not tension headaches.
C) ​both vascular and tension headaches.
D) ​neither tension nor vascular headaches.

Vascular Headaches

A category of headaches believed to be related to the dilation or constriction of blood vessels in the head, such as migraines.

Tension Headaches

Pain produced by sustained muscle contractions in the neck, shoulders, scalp, and face, as well as by activity in the central nervous system.

Stress

A state of mental or emotional strain or tension resulting from adverse or demanding circumstances.