According to the Mayo Clinic, a headache around the left temple can be caused by migraines, tension, sinus infections and from an inflamed artery. While most headaches are temporary and minor, there are times when they warrant a doctor visit.
A one-sided headache is one of the most common symptoms of a migraine. Other symptoms include nausea, tunnel vision and sensitivity to light. If a patient experiences any of these in conjunction with a headache on one side, he should see a doctor for an evaluation.
One-sided headaches caused by tension usually respond well to over-the-counter pain medication and relaxing. Sometimes, the pain extends from the temple to behind the eye, which is known as a cluster headache.
Temporal arteritis occurs when the temporal artery is inflamed, causing a left temple headache along with loss of appetite and a tender scalp. If not treated promptly, the blood supply to the eye is affected, so get medical help right away if these symptoms occur.