Trigger point injections for Cluster Headache typically involve local anesthetic agents (such as lidocaine) and/or corticosteroids injected into specific muscle trigger points associated with headache pain. These injections work by interrupting local nerve signaling, reducing muscle tension, and modulating inflammatory responses in the affected neuromuscular regions. The primary therapeutic effects include pain reduction, muscle relaxation, and potential disruption of the neurogenic inflammatory cascade contributing to headache pathogenesis.