Fatigue is a persistent feeling of exhaustion or low energy that can make everyday activities more difficult. Unlike ordinary sleepiness, it may not improve with rest alone.

Occasional tiredness is common, but ongoing, unexplained fatigue may signal a sleep problem, a medication side effect, or an underlying health condition.

Common Causes of Fatigue

Fatigue can have several contributing factors, including:

• Sleep problems: Insufficient sleep, insomnia or sleep apnea
• Stress and emotional health: Anxiety, depression, grief or ongoing stress
• Nutrition: Not eating enough or certain nutrient deficiencies
• Activity levels: Too little activity or physical overexertion
• Medical conditions: Anemia, diabetes, thyroid disorders, infections or chronic pain
• Medications and substances: Some antihistamines, sleep aids, and other medications, as well as alcohol

Persistent fatigue can also occur with conditions such as myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS). Long-lasting fatigue alone does not establish a diagnosis.

What Does Fatigue Feel Like?

People may describe fatigue as:

• Low energy or exhaustion
• Difficulty concentrating or “brain fog”
• Reduced stamina
• Feeling drained after everyday tasks
• Difficulty keeping up with work, household responsibilities or social activities

Sleep difficulties and mood changes may occur alongside fatigue. Tell your provider about any additional symptoms rather than assuming fatigue is the cause.

How Is Fatigue Evaluated?

Your provider will ask about your sleep, daily routine, medications, emotional health, and when your symptoms began. A physical examination may help identify possible causes.

Depending on your symptoms, testing may include blood work to check for anemia, blood sugar, or thyroid function. Sleep testing or other evaluations may be recommended when appropriate.

There is no single test for every cause of fatigue. Your evaluation should reflect your symptoms and medical history.

Fatigue Treatment and Management

Treatment depends on the cause. It may involve treating a medical condition, addressing a sleep disorder, adjusting medication under medical supervision, or providing mental health support.

Habits that may help include:

• Keep a consistent sleep schedule: Most adults need about 7–9 hours of sleep each night
• Eat balanced meals: Include vegetables, whole grains, and appropriate protein sources
• Stay hydrated: Follow any fluid restrictions your provider recommends
• Balance activity and rest: Choose activities suited to your health and energy level
• Manage stress: Try relaxation techniques, take breaks, or seek counseling when needed
• Limit alcohol and caffeine late in the day: Both can interfere with sleep

Do not push through activities that significantly worsen symptoms afterward. This can occur with ME/CFS and may require pacing and individualized guidance.

Stimulant medications are not a routine treatment for unexplained fatigue. Do not start supplements or change prescribed medications without discussing them with your provider.

When to Seek Medical Care

Schedule an evaluation if fatigue:

• Lasts for several weeks without a clear explanation
• Interferes with daily life
• Does not improve with adequate rest
• Occurs with unexplained weight loss, fever, or night sweats
• Accompanied by loud snoring, nighttime gasping, or frequent awakenings

Call 911 if fatigue occurs with possible heart attack or stroke symptoms, such as chest pressure, shortness of breath, sudden one-sided weakness or difficulty speaking.

Get Help for Persistent Fatigue

If you feel tired all the time, it’s worth discussing. Schedule a visit with tru Primary & Urgent Care to explore possible causes and determine the next steps for your health.