How quickly your energy level returns to normal will depend on
•your energy level before you were diagnosed
•the type of cancer treatment you received
•the intensity of cancer treatment
•the duration of cancer treatment
•the type, intensity, and duration of any pain
•the presence of any depression, anxiety, or other emotional distress
•the soundness of your nutrition
•the quality of your sleep
•your hormonal balance
•ongoing medical problems, such as infection or wound healing, kidney failure, or heart failure •your ability to pace yourself
•your level of fitness
•factors that we cannot measure (cellular changes, your will to live, and so on)
•your need for medications that have a side effect of causing fatigue
In general, people need two days to two weeks to recuperate from uneventful minor surgery. Allow two weeks to three months for recovery from uneventful major surgery. Radiation therapy can cause fatigue lasting for one to five months after the completion of therapy, depending on the area that was exposed and the total amount of radiation received. Chemotherapy lasting four or more months is usually associated with fatigue that persists for six months to a year or two after the last treatment, depending upon the agents used, the intensity of treatment, and the duration of treatment. As progress has been made in the safe administration of aggressive chemotherapeutic regimens for previously uncontrollable cancers, fatigue has become a more common, and often more debilitating, problem.
In general, the more intense your treatment, the worse your symptoms. Exposure to more than one type of treatment—such as surgery plus radiation, or radiation plus chemotherapy—has a cumulative effect on energy levels. The presence of other fatigue-inducing factors, such as anemia or malnutrition, will exacerbate that due to cancer treatments.
These guidelines are very general. Many patients, usually those requiring relatively little treatment, bounce back to their precancer state of well-being quickly. Most people who have received a significant amount of radiation or chemotherapy take weeks to months to feel well consistently. Fatigue is universal after rigorous treatments such as high-dose radiation or chemotherapy requiring a bone marrow transplant, and it usually persists for at least a year or more.
Recognize that many unmeasurable factors affect energy, making it impossible to provide an accurate prediction of when you will feel normal in terms of energy. Although for most survivors fatigue is a temporary, if protracted, problem, for some it becomes a chronic disability, especially if factors that contribute to it persist indefinitely.
Two thirty-six-year-old women had the same type of leukemia and were simultaneously given the same treatment regimen prior to their bone marrow transplants. One year later they were both in remission, but one felt well; her bone marrow had recovered completely, and her blood counts were normal. The other suffered from debilitating exhaustion because her bone marrow had never recovered fully, and she remained anemic. Unless her bone marrow recovered—an increasingly unlikely event the longer she went without improvement—low energy levels would continue to be an issue.
Your treatment changed your body’s physiology, at least temporarily. Something else changed during your treatment, something that had nothing to do with cancer or treatment: you got older. The same intense treatment regimens that are administered over many months, or even years, demand a longer time interval between “before” and “after.” The passage of six to eighteen months of treatment plus another six to twelve months of recovery means you will be comparing yourself to how you were at least one to two years earlier. If you felt poorly before your diagnosis, the time since you last felt well is even longer. A few years might not seem like a lot of aging, but healthy twenty-year-olds often notice a difference in stamina compared with when they were eighteen; forty-year-olds, compared with when they were thirty-eight; or sixty-five-year olds, compared with when they were sixty-three.
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