The feeling of body as a fatigue or tiredness is generally defined as Weakness. But sometimes the term Asthenia is also known Weakness. Some persons experience asthenia in certain parts of their body, such as the arms or legs. And other persons may experience full-body weakness, which is often resulted from the bacterial or viral infection such as influenza or hepatitis. The person who is experiencing weakness may not be able to move a certain part of their body properly. Weakness is temporary, but in some cases it’s chronic. The lack of energy to move certain muscles or even all muscles in the body is best described as Asthenia. The common causes of weakness include anemia, the flu, depression or anxiety, thyroid disease, a lack of sleep, vitamin B-12 deficiency, congestive heart failure, certain muscle diseases and so on. The other main causes include cancer, stroke, heart attack, nerve or muscle injuries, medication overdose, vitamin overdose, poison. In accumulation to undergoing weakness, other indications such as difficulty in breathing, pain and irregular heartbeat may occur.  

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