causes of being tired all the sudden
Summary. 1  Loss of appetite can cause fatigue due to low calorie intake and nutrient deficiency. 2  Fatigue means being constantly tired. 3  It may be a sign of an underlying health condition if youâre feeling fatigue, loss of appetite, and other symptoms such as vomiting and bloating.
Heart rhythm disorder Some heart rhythm disorders can cause a fluttering in the chest, shortness of breath, chest pain or dizziness. Anemia Anemia, a lack of red blood cells, can cause fatigue, pale skin, weakness, dizziness, headache and more.