HI, thanks for using healthcare magic Cough, headache and nasal discharge are symptoms that can occur with allergies or acute upper respiratory tract infection (common cold/flu). Either of these (allergies or infection) can cause irritation/inflammation of the airway and this can cause bleeding. The blood mixed with the infected mucus is the likely cause of the discharge that you are noticing. If you are still concerned, however or if it persists after resolution of your other symptoms, then you should be assessed by your doctor. Treatment would generally consist of the use of anti histamine/decongestants such as zyrtec d, allegra d, claritine d, benadryl d. A topical decongestant may also be helpful as well eg normal saline drops or otrivine I hope this helps