Being diagnosed with cancer was originally a big deal that the sky was falling. Because cancer is still one of the most deadly diseases, anti-cancer treatment drugs and means are so far very limited and helpless. Early screening, early diagnosis and precise treatment have been advocated in recent years. Currently, it has become relatively simple to confirm early diagnosis of certain tumors, such as breast cancer, using advanced technology and tools. According to the latest report of the National Cancer Center, year-on-year incidence and mortality rates of various types of cancers, except for pancreatic cancer and liver cancer, have been controlled to varying degrees in the past 20 years, and the cure rate (5-year survival rate) has been significantly improved. Also, the American Cancer Society reports that of the various options available to treat cancer, the most commonly used treatment option is chemotherapy. Chemotherapy, however, makes all patients suffer unbearably and even have to give up the treatment. Chemotherapy usually involves the application of different chemical drugs to kill the cancer cells remaining in the body, or to shrink the tumor tissue, or to control recurrence and metastasis. This is the unbearable pain that many patients surviving with tumor persist in taking the drugs. Almost all chemotherapy is accompanied by side effects of one kind or another. Because chemotherapy drugs not only destroy cancer cells, but also damage normal cells and tissues, resulting in the same impact and destruction of body functions and health conditions. The American Cancer Society has summarized the seven most common side effects of chemotherapy and hopes that patients and their families will be prepared to encourage them to overcome the difficulties and persevere with treatment. These seven common side effects of chemotherapy are: 1. Sluggish brain, also known as chemo brain. During chemotherapy, patients have difficulty concentrating, are often in a trance, and lose all kinds of interest. If the patient is a school student, it is difficult for them to concentrate on their studies and think properly. Parents must pay attention to the psychological changes of their children. 2. Lack of energy. In addition to the inability to concentrate and loss of interest, patients also feel weak or have no energy to do anything. According to Mayo Medical Center experts, almost all chemotherapy patients feel tired and weak. Therefore, doctors advise patients to take rest and to replenish their energy in time (despite the loss of appetite, they also need to ensure that they eat and drink a certain amount of calories). 3. Pain. Chemotherapy is also accompanied by various pains. Making the feeling of weakness worse, cancer itself can cause pain, and chemotherapy can aggravate the pain and discomfort, and the pain may be chronic or acute. 4.Nervous system allergy. In addition to pain, chemotherapy can also cause neurological symptoms, including numbness in the limbs or local area, or feeling various allergic symptoms and severe discomfort (pain or burning sensation) along the nerve course. Doctors to use some adjuvant therapy to reduce symptoms. 5. Digestive system symptoms. If weakness and pain can still be overcome, some patients also have severe digestive system side effects, such as vomiting, diarrhea, constipation, etc., and even herpes in the mouth and tongue. 6. Cyanosis and bleeding. Some chemotherapy patients may notice bleeding or bruising in certain parts of the body. This is because chemotherapy can damage the patient’s hematopoietic system – bone marrow and blood cell components – causing poor blood clotting. As a result, bleeding is also more difficult to stop than normal. 7. Sexual function and ovulation disorders. Chemotherapy also affects sexual function and libido, and may cause ovulatory dysfunction or non-ovulation in women. Therefore, it is necessary to communicate these physical changes to the doctor in a timely manner.