RED FLAGS OF SECONDARY HEADACHE-   1. HEADACHE  DUE TO BRAIN TUMOUR  - IS OFTEN INTERMITTENT, DEEP BORING, ACHING, OR PRESSURE-LIKE RATHER THAN THE MORE CHARACTERISTIC THROBBING PAIN OF MIGRAINE. 

2. HEADACHE OCCURRING IN ABOVE 50YRS OF AGE. 

3. FIRST EVER WORST HEADACHE OF LIFE OR THUNDERCLAP HEADACHE.

4. CHANGE IN CHARACTER OF HEADACHE MORE INTENSE, MORE FREQUENT, OR LONGER-LASTING, 

5. HEADACHE OCCURRING IN THE EARLY MORNING HOURS.

6.  HEADACHE ASSOCIATED WITH NEUROLOGIC SIGNS - DOUBLE VISION, SEIZURES, PULSATILE TINNITUS OR RINGING IN EARS, CHANGES IN PERSONALITY OR SUDDEN LOSS OF MEMORY,  CONFUSION, IMPAIRED ALERTNESS OR CONSCIOUSNESS. HEADACHE PRECIPITATED BY VALSALVA  MANEUVER, POSTURAL AGGRAVATION, OR PAPILLEDEMA.