Identification

• Fatigue is a symptom that can be related to a host of circumstances or conditions. This includes bad sleeping habits, being overworked or physical illness. Consult a medical professional, as anemia and other medical ailments are diagnosed through medical lab tests that require a doctor's order.
  
  

Anemia

• Anemia is a health condition that causes people to feel very tired. According to the National Anemia Action Council website, anemia develops due to an insufficient healthy red blood cell supply in the body. Red blood cells transport hemoglobin, a compound full of iron, throughout the body's cells. This means that an anemic individual's body does not receive enough oxygen. The person will generally experience an overall feeling of tiredness. Health care professionals diagnose anemia using blood tests and physical assessment. An unbalanced diet can contribute to a feeling of tiredness and lack of energy. Diets low in iron rich foods can lead to feeling sluggish. Iron is an essential nutrient according to the Office of Dietary Supplements website. Iron facilitates oxygen transport in the blood. Iron rich foods include turkey, chicken, clams, shrimp, beef, pork and shellfish.
  
  

Lack of Sleep

• According to a study cited by the National Sleep Foundation, adults typically need between seven and eight hours of sleep per night. According to the Harvard Health Watch, lack of sleep interferes with body processes and contributes to weight gain, poor memory, accidents and leaves many "too tired" for favorite activities.
  
  

Hypothyroidism

• According to MedlinePlus, hypothyroidism is a condition where the thyroid produces insufficient levels of thyroid hormone. The thyroid regulates metabolism via hormones. Hypothyroidism causes relate to thyroid inflammation, immune system problems, congenital birth defects, thyroid excision by surgery and radiation treatments. The side effect of certain drugs like amiodarone, overactive thyroid drugs, lithium and radiation drugs can cause hypothyroidism. Symptoms of the condition includes sensitivity to cold, depression, fatigue, weakness and weight gain. Treatment for hypothyroidism increases hormone levels and uses medications like levothyroxine.
  
  

Chronic Fatigue Syndrome

• Chronic fatigue syndrome sufferers experience extreme fatigue and tiredness that does not improve by resting. It is a complex condition that requires management by a health care professional. Signs of the condition include duration of six or more months, despite bed rest, persistent sore throat and problems concentrating that interfere with work, school and home life. According to the Centers for Disease Control and Prevention, there are no specific causes or lab tests nor specific medications for treatment. Treatment needs to be tailored to the individual. Options include using counseling, exercise therapy, antidepressant medications, paint therapy and support groups. These treatment options encompass the variety of aspects of the condition to help the individual regain energy and work to counter fatigue levels.
  
  

Depression

• For individuals battling depression, it involves more than feeling sad. According to the National Institute of Mental Health, depression disrupts normal life and requires treatment for the condition to improve. In addition to feelings of guilt, restlessness and hopelessness, depression induces physical problems like fatigue, insomnia and pain. A number of treatment options exist, including antidepressant medication and psychotherapy.