Breast cancer is the abnormal growth of breast cells, which results in the development of cancerous breast tissue, known as a tumour. These tumours can appear and feel like small lumps on your breast - and there are other symptoms to look out for too.
This is a companion discussion topic for the original article at https://patient.info/news-and-features/how-to-check-for-breast-cancer-and-what-a-lump-feels-like