Fatigue is a term used to to describe the general overall feeling of tiredness and/or a lack of energy. Other words that are sometimes used in place of fatigue include exhaustion, weariness, and lethargy.
Common causes of low back pain (lumbar backache) include lumbar strain,
nerve irritation, and conditions of the bone and joints.
Some medical issues and conditions that can lead to fatigue are:
anemia,pain,Addison’s disease (a disorder affecting your hormone levels)
hypothyroidism (underactive thyroid)
hyperthyroidism (overactive thyroid)
arthritis, insomnia and other sleeping disorders, eating disorders, such as anorexia,
autoimmune disorders, fibromyalgia, congestive heart failure,cancer, diabetes, kidney or liver disease, infection,
chronic fatigue, syndrome, chronic
obstructive pulmonary disease (or COPD, which makes it difficult to breathe), emphysema, restless legs syndrome