What are the causes?
1. Dysfunction in the Upper Cervical Joints (C1–C3)
CGH typically arises from irritation or dysfunction in the upper cervical joints, especially the atlanto‑occipital (C1) and atlanto‑axial (C2) joints. These joints are heavily involved in head movement and are sensitive to strain.
2. Trigeminocervical Convergence (Referred Pain Mechanism)
Pain-sensitive structures in the upper neck send signals to the trigeminocervical nucleus, a shared sensory pathway with the trigeminal nerve. This neuroanatomical overlap means irritation in the neck can be felt as a headache around the eyes, forehead, temples or back of the head.
3. Neck Trauma or Whiplash
Any injury involving sudden acceleration–deceleration forces (e.g., car accidents, sports injuries) can irritate cervical joints, nerves and soft tissues, increasing sensitivity and leading to chronic headache symptoms.
4. Muscle Tension and Myofascial Trigger Points
Tightness or spasms in muscles can refer pain into the head. Muscle tenderness on the symptomatic side is a common feature.
5. Postural Strain (Forward Head Posture)
Sustained or awkward postures — often from computer work, phone use, or long periods sitting — overload the cervical joints and muscles, leading to CGH. Poor posture is highlighted as a major triggering factor.
6. Cervical Disc Pathology
Aseptic inflammation or irritation from disc issues can activate C‑fiber pain pathways, contributing to headache symptoms