Possible Causes:a. Tension-type headache: Common and often related to stress or muscle tension.b. Migraine: Can cause unilateral head pain, sometimes with nausea or light sensitivity.c. Temporal arteritis: Rare, but serious; involves inflammation of blood vessels.

Immediate Actions:a. Monitor symptoms: Note any triggers or patterns.b. Over-the-counter pain relief: Consider using analgesics like Crocin Advance, if suitable.

When to Seek Medical Advice:a. If pain persists or worsens.b. If accompanied by other symptoms like vision changes or jaw pain.