Results for: Fatigue
Emergency Warning Signs
Call 911 or go to the emergency room immediately if you experience:
- Difficulty breathing or shortness of breath
- Chest pain or pressure
- Sudden numbness or weakness in face, arm, or leg
- Sudden confusion or trouble speaking
- Severe allergic reaction (swelling, difficulty swallowing)
- Heavy bleeding that won't stop
- Loss of consciousness
- Signs of stroke (face drooping, arm weakness, speech difficulty)
20 Possible Conditions
These conditions are listed by likelihood based on the symptom. This is not a diagnosis.
Iron-deficiency anemia
A shortage of iron reduces red blood cell production, leading to decreased oxygen delivery and fatigue.
Hypothyroidism
Underactive thyroid slows metabolism, often causing persistent tiredness and weight gain.
Sleep apnea
Repeated airway obstruction during sleep disrupts restorative sleep, resulting in daytime fatigue.
Depression
Mood disorder that commonly includes low energy, loss of interest, and chronic fatigue.
Chronic fatigue syndrome (Myalgic Encephalomyelitis)
A complex disorder characterized by profound, unexplained fatigue lasting at least six months.
Diabetes mellitus (poorly controlled)
High blood glucose can cause fatigue due to impaired cellular energy utilization.
Heart failure
Reduced cardiac output limits oxygen delivery to tissues, leading to exhaustion even with mild activity.
Chronic kidney disease
Impaired kidney function leads to anemia and toxin buildup, both of which cause fatigue.
Vitamin D deficiency
Low vitamin D levels are linked to muscle weakness and a general sense of tiredness.
Adrenal insufficiency (Addison’s disease)
Insufficient cortisol production reduces the body’s ability to respond to stress, causing fatigue.
Rheumatoid arthritis
Autoimmune inflammation can cause systemic fatigue in addition to joint pain.
Infectious mononucleosis
EBV infection leads to prolonged fatigue, sore throat, and swollen lymph nodes.
Chronic obstructive pulmonary disease (COPD)
Reduced lung function limits oxygen intake, causing persistent exhaustion.
Cancer (especially during treatment)
Malignancy and therapies such as chemotherapy often produce severe fatigue.
Medication side effect (e.g., antihistamines, beta‑blockers)
Certain drugs can depress the central nervous system, leading to drowsiness and fatigue.
Shift work sleep disorder
Irregular work hours disrupt circadian rhythms, resulting in daytime sleepiness.
Pregnancy (first trimester)
Hormonal changes and increased metabolic demands often cause marked tiredness.
Depressive burnout
Prolonged occupational stress can lead to emotional exhaustion and physical fatigue.
Post‑COVID‑19 syndrome (Long COVID)
Persistent fatigue is a common lingering symptom after acute SARS‑CoV‑2 infection.
When to Seek Emergency Care
While many conditions can be managed with home care or a doctor's visit, some situations require immediate medical attention. Seek emergency care if:
Heart-Related
Chest pain, rapid heartbeat, or shortness of breath
Brain-Related
Severe headache, confusion, or sudden vision changes
High Fever
Fever above 103°F (39.4°C) or fever with stiff neck
Severe Bleeding
Uncontrolled bleeding or coughing up blood
Medical Disclaimer
Medical Disclaimer: The information provided on this website is for general informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website. If you think you may have a medical emergency, call your doctor, go to the emergency department, or call 911 immediately.
Sources: Mayo Clinic, WebMD, CDC, NIH