Fatigue or low energy
During your visit, the provider will ask about how long you have been tired, the quality of your sleep, daily stressors, diet, exercise, medications and substances such as caffeine or alcohol. They will ask whether you have unintentional weight loss, fever, loss of appetite, night sweats, recent infections, anxiety or depression. A physical exam checks vital signs and looks for red flags such as pallor, swollen lymph nodes, goitre, heart murmurs or swelling of the legs, which can indicate underlying diseasehttps://pmc.ncbi.nlm.nih.gov/articles/PMC9815175/#:~:text=Red%20flags%2C%20which%20may%20point,cardiac%20failure%2C%20liver%20disease. Because many cases are related to lifestyle imbalance, physicians often recommend rest and watchful waiting if no red flags are present.
There is no single medication for fatigue itself. Treatment focuses on correcting underlying causes: iron supplements for iron‑deficiency anemia, vitamin B12 or folate for deficiencies, levothyroxine for hypothyroidism and other hormones for endocrine disorders, and proper management of chronic diseases like diabetes or heart disease. If depression or anxiety is suspected and non‑pharmacologic measures fail, a trial of a selective serotonin reuptake inhibitor (SSRI) such as fluoxetine or sertraline may be consideredhttps://pmc.ncbi.nlm.nih.gov/articles/PMC9815175/#:~:text=. Stimulant or sedative medications are generally avoided unless prescribed for specific conditions like narcolepsy.
Initial tests may include a complete blood count to look for anemia or infection; electrolyte panel, liver and kidney function tests; thyroid function tests (TSH and free T4); fasting glucose or hemoglobin A1c; and urinalysishttps://pmc.ncbi.nlm.nih.gov/articles/PMC9815175/#:~:text=fatigue%20include%20full%20blood%20count%2C,of%20tests%20should%20be%20employed. Inflammatory markers such as C‑reactive protein or erythrocyte sedimentation rate are used when infection or autoimmune disease is suspected. Tests for vitamin B12, folate and iron studies are considered if deficiencies are possible. In women of child‑bearing age, a pregnancy test may be done. Further testing (e.g., cortisol levels, sleep study, chest X‑ray, electrocardiogram) is guided by the history and exam.
Imaging is not routinely required for fatigue. Chest X‑rays, echocardiograms or chest CT scans may be ordered if symptoms suggest heart or lung disease. Brain imaging, abdominal ultrasound or CT scans are reserved for concerning findings on history or exam. Overnight sleep studies help diagnose sleep apnea or other sleep disorders if daytime fatigue is associated with snoring or pauses in breathing.
Seek prompt medical evaluation if fatigue is accompanied by red flags such as unintentional weight loss, persistent fever, loss of appetite, unexplained lumps, abnormal bleeding, shortness of breath, chest pain or palpitationshttps://pmc.ncbi.nlm.nih.gov/articles/PMC9815175/#:~:text=Red%20flags%2C%20which%20may%20point,cardiac%20failure%2C%20liver%20disease. Other warning signs include severe headaches, confusion, dizziness, syncope, muscle weakness, jaundice, dark urine or blood in stool. If you feel depressed or have thoughts of self‑harm, contact your provider immediately.
For physiologic fatigue linked to lifestyle factors, a watchful waiting approach with lifestyle modifications is reasonable. Your doctor may schedule a follow‑up visit in two to four weeks to reassess your symptoms and review any test resultshttps://pmc.ncbi.nlm.nih.gov/articles/PMC9815175/#:~:text=Scheduling%20an%20early%20appointment%20for,or%20if%20reassessment%20is%20required. Patients with an identified cause of fatigue should be monitored at appropriate intervals to ensure that treatment is effective; failure to improve warrants re‑evaluation and possibly a referral. Chronic fatigue syndrome or long COVID may require multidisciplinary management and regular follow‑ups with specialists.
Adopt good sleep hygiene: go to bed and wake at the same time daily, avoid caffeine, nicotine, alcohol and heavy meals before bedtime, limit screen time and make the bedroom dark and quiethttps://pmc.ncbi.nlm.nih.gov/articles/PMC9815175/#:~:text=Non. Engage in regular physical activity such as walking, swimming or yoga for at least 30 minutes on most dayshttps://pmc.ncbi.nlm.nih.gov/articles/PMC9815175/#:~:text=Exercise%20therapy%20and%20sleep%20hygiene,6, but avoid strenuous exercise late in the evening. Eat a balanced diet rich in whole grains, fruits and vegetables, lean proteins and healthy fats; stay hydrated; and maintain a healthy weight. Manage stress through mindfulness, deep breathing or cognitive behavioural therapyhttps://pmc.ncbi.nlm.nih.gov/articles/PMC9815175/#:~:text=Exercise%20therapy%20and%20sleep%20hygiene,6. Avoid overusing caffeine, sedatives or alcohol to cope with fatigue, and reduce exposure to shift work if possible.
Your primary care provider is your first point of contact for evaluation and monitoring. Depending on the suspected cause, they may coordinate care with a nutritionist to address dietary deficiencies, a sleep specialist for sleep apnea, an endocrinologist for thyroid or adrenal disorders, a cardiologist or pulmonologist for heart or lung conditions, a psychiatrist or psychologist for mood disorders, or a hematologist for anemia. Physical therapists may guide graded exercise therapy, and social workers can help manage caregiving stress. A multidisciplinary team approach is often necessary for chronic fatigue syndrome or long COVIDhttps://pmc.ncbi.nlm.nih.gov/articles/PMC9815175/#:~:text=Primary%20care%20physicians%20should%20consider,cognitive%20behavioural%20therapy%2C%20psychotherapy.