The goal of this observational study is to assess the pain sensitivity in tension-type headache patients. The main question it aims to answer is:

- Are signs of central sensitization present in tension-type headache?

Participants will be asked to fill out baseline questionnaires and they will be assessed during 1 test moment (static and dynamic quantitative sensory testing).

Researchers will compare tension-type headache patients with healthy controls to see if signs of central sensitization are only present in the tension-type headache group.

Inclusion Criteria:

1. Diagnosis of tension headache according to globally recognized criteria (ICHD-3) or verified by a physician
2. Diagnosis of tension headache confirmed by a questionnaire (Headache Screening Questionnaire)
3. Not pregnant or given birth in the past year since a change in hormone levels can affect pain experience
4. Adults between the ages of 18 and 65
5. Proficient in the Dutch language

Exclusion Criteria:

1. Other diagnosis of headache or a mixed form
2. Other existing condition involving central nervous system sensitivity
3. Other structural neurological syndromes
4. Any condition involving the brain in the past
5. Procedure on the head, neck, or shoulder in the past 3 years
6. Currently suffering from a psychiatric condition
7. Athletes competing at a competitive level
8. Not proficient in the Dutch language
9. Currently pregnant.

This study will involve participation from various populations, specifically patients with episodic tension headache, patients with chronic tension headache, and healthy pain-free controls.