Hello. There is no such condition which causes greying of hair due to headache so its just a coincidence. Secondly headaches can occur due to numerous causes like ear infection, infection of sinuses,dental issues, stress & anxiety can also cause it, migraine might also be one of the reason. So since there are numerous causes for this and if your symptom has persisted for a longtime kindly consult a physcian to ruleout this things.
Answered2016-04-04 15:12:08
Let others know if this answer was helpful