Hemicrania continua headache — This headache causes continuous pain on one side of the head for 24 hours while also causing sharp attacks of pain A person will get a runny nose and may also A dull, "tightening" feeling that doesn't throb, or when your head is tender to the touch, is probably a tension headache These are very common Many things can set one off, including These are Cluster headaches and migraines sometimes occur on the left side of the head, according to Harvard Health Publications It is possible for a sinus headache to be on one side, Michigan Headache & Neurological Institute states In certain cases, a brain aneurysm produces pain on the left side, reports Healthline
Reasons Why I Have A Headache On My Left Side National Headache Institute