External-pressure headache is separated into 2 types. The first is external-compression headache and the second is external-traction headache. External-compression headache is caused by compression of the scalp, such as by a tight band around the head from goggles, helmet, hat, etc. The headache begins within 1 hour of a continuous external compression of the forehead or scalp. The headache is most noticeable at the site of external compression, and it resolves within 1 hour of the removal of the external compression.
External-traction headache has also been called “ponytail headache”, and is caused from traction on the scalp. This headache begins during continuous external traction on the scalp. The headache is most noticeable at the site of external traction, and it resolves within 1 hour of the removal of the external traction.