What would cause a headache on your left side?

Answer by  cherylm720 (23)

A sinus infection can cause a headache on one side. A head injury can cause an ache on one side, but if that were the cause, you wouldn't be asking.

Answer by  juanita57 (1374)

Headache's are caused by so many different things. Just having it on the left side could be a vessel not letting the blood flow through or maybe a blood clot. I guess it could be just sinuses. I would go on to the doctor and get checked out thouroughly because you just never know if it's serious or not.

Answer by  sarah237 (385)

A migrane can cause a headache on your left side.Migranes can sometimes stay with you longer than a headache that last a few hours.

Answer by  tchevey17 (3)

it could be a high blood pressure and you could of had some sugar prpblems and it may worsen with some certain head movements and could spread around your head