But some headaches call for prompt medical care. Here are some warning signs for when you should worry about headaches: headaches that first develop after age 50; a major change in the pattern of your headaches; an unusually severe headache; head pain that increases with coughing or movement; headaches that get steadily worse, Severe headaches can be caused by an aneurysm, meningitis and more. Learn the differences between a normal and severe headache and if you should see a doctor., High blood pressure can lead to stroke, heart disease, and other serious health issues. This is why it’s important to know what your blood pressure is. If it's high (above 140/90), talk to your healthcare provider about ways to get your numbers down., Signs of Serious Conditions. Sometimes, a headache means something more serious. If your left-head pain is very bad and comes with these signs, get help right away: Vision problems or loss of vision; One side of your body suddenly feels numb or weak; You feel confused or have trouble talking; The pain stays or gets worse after taking medicine, In some instances, left-sided head pain could indicate more serious conditions such as: Stroke : Sudden onset headache accompanied by confusion or difficulty speaking. Brain Tumors : Persistent headache that worsens over time., .