How do people feel when tumor cells spread

Modern society continues to develop and medical standards continue to improve. However, there is still no complete way to defeat cancer. If cancer is discovered late, it will easily metastasize and spread at a certain stage, causing greater harm to the body. , then why does cancer spread? How will people feel when it spreads?

First, let’s talk about what diffusion is. Tumor spread and metastasis refers to the process in which cancer cells invade from the original primary lesion into other normal healthy tissues through blood, lymph nodes, or direct contact, forming new cancer lesions and continuing to grow. The spread and metastasis of cancer are often the fundamental reason why cancer is difficult to treat and prone to relapse after treatment. The spread of cancer cells is irregular, and the spread of cancer cells and the path they take will be damaged, which poses a serious threat to human life and health.