Health factors and nutritional deficiencies linked to fatigue

Fatigue is a subjective symptom characterized by exhaustion, lack of energy, or increased tiredness due to effort or stress. According to data from the Centers for Disease Control and Prevention (CDC), over 70% of adults reported experiencing fatigue at some point in the three months prior to a September 2026 report, with approximately 1 in 10 people feeling tired most days.

Sudden fatigue can be a sign of various medical issues, including viral or bacterial infections. Common viral causes include influenza, COVID-19, and infectious mononucleosis, while bacterial infections such as urinary tract infections, pneumonia, or dental abscesses can also trigger severe exhaustion.

Nutritional deficiencies are also significant contributors to low energy levels. Key deficiencies include Vitamin D, Vitamin B12, and omega-3 fatty acids. For instance, more than 40% of Americans are estimated to have a Vitamin D deficiency, which is linked to muscle weakness and fatigue. Additionally, inadequate Vitamin B12 levels can impair energy production and lead to anemia.