Tension headaches are caused by muscle contractions in the head and neck regions. They are the most common type of headache and can cause mild to intense dull pain in the head, neck, and behind the eyes. Tension headaches are usually episodic and mild or moderate compared to migraines. Treatment includes over-the-counter pain medications which should be used sparingly to avoid rebound headaches, as well as stress management, biofeedback, and cognitive behavioral therapy. Identifying triggers and preventing factors like stress, poor posture, and eye strain can help reduce tension headache episodes.