Cancer is a highly deteriorating disease that can threaten one's health if not treated promptly and controlled in a reasonable manner. Approximately 10,000 people are diagnosed with cancer every day, and an average of 7 people die from cancer every minute. In China, over 1.6 million people are diagnosed with cancer each year, resulting in 1.2 million deaths. Early detection of cancer is crucial, and timely treatment can control its progression.

Here are five signs that indicate improvement in the body during cancer treatment: 

1. Changes in tumor markers: Blood tests can show changes in tumor markers such as EBVDNA for nasopharyngeal cancer, CEA for colorectal cancer, PSA for prostate cancer, and AFP for liver cancer. A decrease in tumor marker levels indicates improving condition.

2. Significant reduction in pain: Cancer patients often experience severe pain, especially in advanced stages. If the pain noticeably decreases during treatment, it is a sign that the treatment is effective. 

3. Stable body weight: As the body improves, weight becomes more stable, and excessive weight loss is reduced. This indicates a gradual improvement in cancer. 

4. Improved nutrition: After cancer diagnosis, many patients experience physical manifestations such as fatigue, loss of appetite, and weight loss. If the patient's nutrition improves, it suggests that cancer cell growth has been restrained. 

5. Better mental state: Cancer patients often suffer from a low mood due to the burden the fast-growing cancer cells place on the body. When the patient's mental state improves, it indicates that the disease is being controlled.

To extend the lifespan of cancer patients, it is important to maintain a positive mindset, undergo regular check-ups to detect any metastasis, and pay attention to diet. Some common symptoms related to cancer are shoulder pain, chest pain, and lower back pain. These symptoms, along with others, should be monitored and treated under a doctor's guidance.