What are the common causes of tension-type headaches?

What Normally Causes Tension-Type Headaches

The etiology of tension-type headache is multifactorial, involving both genetic and environmental factors, with stress being the most commonly reported trigger, acting through hyperalgesic effects on sensitized central pain pathways and increased pericranial muscle sensitivity. 1, 2

Primary Pathophysiological Mechanisms

Central Pain Processing Dysfunction

• Central sensitization is the key underlying mechanism in tension-type headache, where the central nervous system exhibits increased pain sensitivity and altered pain processing 3
• Stress triggers headaches through hyperalgesic effects on already sensitized pain pathways, reducing the threshold to noxious input from pericranial structures 2
• Pre-existing muscle tenderness and stress-induced reduction in pain thresholds predict both the development and intensity of headache episodes 2

Musculoskeletal Components

• The cervical spine plays a significant role in tension-type headache pathophysiology, though it represents a "component" rather than the primary "source" of the headache 4
• Patients exhibit cervical musculoskeletal dysfunctions including forward head posture, limited cervical range of motion, positive flexion-rotation test, and cervical motor control disturbances 4
• Pericranial muscle tenderness is consistently elevated in tension-type headache sufferers compared to healthy controls 2

Common Precipitating and Aggravating Factors

Most Frequent Triggers

The following factors are most commonly acknowledged by patients with tension-type headache 5:

• Stress and tension (most common trigger) 2, 5
• Not eating on time 5
• Fatigue 5
• Lack of sleep 5

Physical Activities

• Physical activity, straining, and bending over can aggravate existing headaches 5
• Coughing and sneezing may worsen symptoms 5

Daily Activities

• Reading and driving can precipitate episodes 5
• These activities likely contribute through sustained neck postures and visual strain 5

Comorbid and Secondary Factors

Medical Disorders

• Several systemic medical conditions can worsen pre-existing tension-type headache or present with overlapping clinical features 6
• Hypothyroidism, sleep disorders, and hypertensive crisis may present with headache features similar to tension-type headache 6
• Psychiatric disorders and fibromyalgia commonly co-occur with tension-type headache 6

Clinical Implications

Important Distinctions

• Unlike migraine, tension-type headache is not typically triggered by weather, smell, smoke, or light - these factors help differentiate migraine from tension-type headache 5
• The pain is characteristically described as pressing, dull, with the sensation of a tight band around the head 1

Prevalence and Impact

• Tension-type headache is the most common primary headache disorder worldwide, with lifetime prevalence of 46% to 78% 1
• Despite being less severe than migraine, it causes greater disability and accounts for more missed work days due to its high prevalence 1