Because cancer is often caused by gene mutation, if mutation occurs, we can compare the normal gene sequence with the cancer sequence, and then we can get the corresponding cancer phenomenon.

If it is a general physical examination, it is often found that cancer is already in the middle and late stages. At this time, the overall symptoms of cancer are more obvious.

If there are obviously more white blood cells, and then there are obvious cancer cells and blood clots in some special parts, then cancer can be diagnosed.