Self-detection methods for male breast cancer include touching, observing symptoms and reviewing the disease history, etc. However, self-detection is often inaccurate and requires further examination in the hospital. 1. Touch: Men can touch their breasts to see if there are lumps with unclear boundaries and whether there is any pain in the breasts. Touch other parts of your body to see if there are any other lumps. 2. Observe the symptoms: you need to observe the symptoms in the breast area, such as whether there is pain, whether there is bleeding, fluid overflow, blood overflow and other manifestations in the nipple. 3. Review the history of diseases: for example, whether there is any family genetic history in the family, whether they have been taking breast estrogen drugs for a long time, or whether they have any other chronic diseases such as liver. If men suspect breast cancer after self-examination, they should go to the breast surgery in time to do systematic examination and make a clear diagnosis.