No, a mammogram itself does not cause or spread breast cancer. Mammography is a medical imaging technique used for breast cancer screening and diagnosis. During a mammogram, the breast is exposed to a small amount of ionizing radiation to create images of the breast tissue. The level of radiation used in mammography is generally considered to be safe and the benefits of early cancer detection through mammograms outweigh the potential risks associated with the low radiation exposure.

However, it's important to note that like any medical procedure, mammography is not without risks. There is a very small amount of radiation exposure associated with mammograms, and while this is generally considered safe, repeated exposure over time could theoretically increase the risk of cancer. The benefits of detecting and treating breast cancer at an early stage, when it is most treatable, typically outweigh the potential risks associated with the radiation exposure from mammography.

If you have concerns about mammography or breast cancer screening, it's always a good idea to discuss them with your healthcare provider. They can provide information specific to your health history and help you make informed decisions about your screening options.