Anemia
Anemia means iron deficiency in the body. The tissues are deprived of oxygen and you feel tired and energy-free. Other symptoms; muscle aches, shortness of breath, trouble breathing, yellowing skin
Diabetes
Diabetes occurs when the body uses insulin incorrectly or produces insufficient amounts. This is why blood sugar levels rise dramatically. Severe fatigue is one of the symptoms of diabetes. Other symptoms; sudden increase in hunger and thirst, dry skin, weight loss
Alzheimer's disease
Recently, researchers discovered that drowsiness could be a symptom of Alzheimer's disease. This means that feeling tired throughout the day could be an early sign of this illness. Other symptoms; apathy, short-term memory loss, being irritable
Chronic fatigue syndrome
If you feel lethargic for 3-4 months, you may have chronic fatigue syndrome. This situation causes quick fatigue. Other symptoms; joint pain, myalgia, headache, and poor concentration.