Decisions become more difficult. It's as if your mind is tired, too. It may be difficult to be pleasant or happy when you're constantly tired. This may put a strain on your relationships. There are many causes of fatigue.
Causes differ from person to person.
Fatigue may be caused by one factor or it may be caused by several factors, such as those listed below. The process of inflammation can cause pain and swelling and also may cause fatigue. However, these positions can put extra stress on your joints and muscles. This can lead to fatigue. The physical and emotional energy you use trying to deal with pain can make you feel fatigued.