There is no evidence that deodorant causes breast cancer. Whatever deodorant you use, it will not increase your risk of breast cancer.
Mobile phones are relatively new, so there is no long term evidence about their lasting effects. However, the best research says that mobile phones do not cause cancer. The radio waves from mobile phones in the UK are too weak to cause cancer. 4G and 5G transmit radio waves too, but they are also too weak to cause cancer. We recommend you do not keep your phone in your bra, but only for your own comfort!
Wearing an underwired bra will not increase your risk of breast cancer. Wearing the wrong size bra will not increase your risk of breast cancer. Wearing a bra is a choice. It’s up to you what you wear. If you choose to wear a bra, you will be more comfortable in a bra that fits well. Your choice either way will not increase your risk of breast cancer.
There are risks involved with all surgery, and there are risks involved with all implants (prosthesis). However, there is no evidence that breast implants increase your risk of breast cancer. If you have breast implants, you should be checking your chest regularly. We have more information all about breast implants here.