Fatigue is a condition of tiredness or weakness that is physical or mental, or both. Chronic fatigue syndrome is recurrent, long-term fatigue that may be combined with other factors.
Some medicines can cause fatigue.
Your doctor will review your symptoms and ask about your daily routine, work habits, and environmental conditions. He or she will give you a physical exam and may want you to have basic blood tests to rule out diseases that may cause fatigue, such as diabetes, hypothyroidism, heart disease, lung disease, and anemia. If you have a history of emotional stress or recurrent anxiety or depression, your doctor may diagnose fatigue caused by psychological disturbances. Treatment depends on the cause. If fatigue is a symptom of another condition or disease, that condition or disease will be the primary focus of treatment.