There are a number of side effects of birth control pills. Headaches, breast tenderness, and nausea are the most common. If you have one of these symptoms, talk to your healthcare provider. If you notice any new side effects, such as vomiting, nausea, or dizziness, talk to your doctor. Your health care provider can prescribe an alternative method based on your medical history. If you are concerned about the potential risks of using a pill, talk to a nurse, or a health professional.