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.
Middle ear infection A middle ear infection puts pressure on the eardrum, causing pain and, sometimes, hearing loss. Dental abscess A dental abscess, a severe tooth infection, can cause throbbing pain, swelling, redness, fever, and more.