The exact cause of tension headaches is unknown and can differ if the tension headache is infrequent or frequent (chronic). Some research suggests that the pain occurs from muscle tenderness and nerve sensitization on the outside of the head. This can be brought on by stress, poor posture, and possibly weak neck muscles. Increased frequency of tension headache is thought to occur because the nerves around the head become more and more sensitive over time.[1][2] Episodic headaches can be secondary to factors such as poor sleep, muscle tension, eye strain, low blood sugar, and others.[3]
References
- ^Paul J Millea, Jonathan J BrodieTension-type headacheAm Fam Physician.(2002 Sep 1)
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- ^Joseph R Yancey, Richard Sheridan, Kelly G KorenChronic daily headache: diagnosis and managementAm Fam Physician.(2014 Apr 15)