Also nicotine level can cause decreased appetite. Cancer A malignant tumor can not be recognized sometimes to the late stages of the disease. Fatigue and weight loss may be the only signs in the initial phases. The weight loss is also in spite of a normal eating behavior, because the tumor cells consume a lot of energy for their growth. A tumor vitamin of health may also cause symptoms such as fever, extreme tiredness (fatigue), or weight loss. Chronic pain can occur in diseases such as fibromyalgia or for unknown reasons. They may occur with other symptoms, for example: Disabilities; Sleep disorders; Irritability; Depression. Diabetes Both diabetes mellitus and diabetes insipidus may result in weight loss.


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