A migraine is usually a moderate or severe headache felt as a throbbing pain on one side of the head.
Our Health A-Z contains more information on Migraine.
A subarachnoid haemorrhage is a type of stroke caused by bleeding in and around the brain.
Our Health A-Z contains more information on Subarachnoid haemorrhage.
Important: If you have these symptoms, they may be unrelated to any of these conditions listed. If you are concerned about your symptoms then you should see a doctor.