Is long-term weakness cancer?

There are many reasons for long-term fatigue symptoms, such as young people often work overtime, stay up late, irregular life schedule, lack of exercise, so there will be chronic fatigue syndrome, resulting in long-term fatigue symptoms. Usually if lack of exercise, insufficient nutritional supplements, or young women excessive diet, may show long-term fatigue symptoms. Some diseases are also the cause of long-term fatigue, hypothyroidism, malignant tumors, blood system diseases, such as leukemia caused by long-term fatigue, can not be diagnosed as cancer after a long period of fatigue symptoms.