If HA r o secondary causes by hx e g systemic sx hx of CA HIV immunosuppression TB neuro s sx thunderclap onset age 50 positional precipitated by Valsalva hx new onset in pregnancy 1

<b>If HA, r/o secondary causes</b> by hx (e.g., systemic sx; hx of CA/HIV/immunosuppression/TB; neuro s/sx; thunderclap onset; age >50; positional precipitated by Valsalva; hx; new onset in pregnancy).¹