Nobody knows why most forms of lymphoma cause intense fatigue. Some researchers suspect this may happen because of the high energy consumption causing the weight loss. Just about everybody feels tired from time to time, of course. However, fatigue becomes a potential sign of lymphoma when it happens a lot and without a clear cause. Sudden drops in energy, or the feeling of being worn out with little or no physical activity, is one of the most common symptoms for lymphoma patients. Unfortunately, as with so many of the disease's other symptoms, fatigue is a part of many other conditions. It might also happen when you have nothing wrong at all. This makes finding the real cause of the problem difficult or impossible without a lot of testing.

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