If a headache is an indication of a serious condition, it will usually come with other signs, Dr. Jacqueline Kraveka, an oncologist and professor at the Medical University of South Carolina, says. “But they can also be the only symptom.”
If you are among them, how would you tell the difference between your usual headaches and the more serious kind? “You can keep a headache diary,” Dr. Kraveka says. “This way you will see how long they last, when they occur, and after what activity.” Anything out of the ordinary is a sign you should see a doctor.