Most medications do not prevent you from donating blood. Common medications such as those used to control blood pressure, birth control pills and over-the-counter medications do not affect your eligibility. If you have recently taken antibiotics, you must have completed the course prior to donating.
Yes, a tooth infection can cause a headache. Also, be aware that certain sinus conditions can mask as tooth problems.
Some tooth problems cause sharp, shooting pain and some cause dull aches. Some tooth pain comes and goes and some is persistent and difficult to relieve. Throbbing tooth pain is often associated with inflammation in or around the tooth caused by: 1  infection in the center (the pulp) of the tooth. 2  infection of the gums. 3  sinus infection. 4  cracked or chipped teeth. 5  broken crowns or fillings.