What is fatigue?

Fatigue is a feeling of tiredness or weakness. You lack the physical or mental energy to do your usual activities.

What is the cause?

Fatigue can happen for many reasons, but it is especially likely when you are having a lot of physical or mental stress. Fatigue may be caused by:

  • An illness
  • Chronic pain
  • Hormone problems, such as thyroid problems
  • Overexertion
  • Poor physical condition (being “out of shape”)
  • Lack of exercise
  • Not enough sleep
  • Overweight
  • Poor diet
  • Stress
  • Emotional or psychological problems, especially depression or grief
  • Some medicines

Fatigue can also be a symptom of a heart attack, especially in women. In this case, it usually is new and is severe fatigue that starts a day or two or just a few hours before a heart attack. Sometimes the fatigue starts a couple of weeks before a heart attack. Because new, unexplained fatigue can mean a heart attack is about to happen, it should be checked by your healthcare provider.

Overwhelming fatigue that lasts for at least 6 months and interferes with your daily life may be caused by a medical problem called chronic fatigue syndrome.

What are the symptoms?

Some ways of describing the feelings of fatigue are:

  • Weakness
  • Tiredness
  • Indifference or lack of interest in the things you usually enjoy
  • Lack of energy
  • Lack of your usual endurance or stamina

How is it diagnosed?

Your healthcare provider will ask about your symptoms and medical history. Your provider may ask about your daily routine, work habits, environment, medicines, and emotional well-being. Your provider may examine you. You may have blood tests to check for diseases that can cause fatigue, such as diabetes, hypothyroidism, heart disease, lung disease, and anemia.

How is it treated?

The treatment depends on the cause. If fatigue is a symptom of another condition or illness, such as thyroid problems, that condition or disease will be the focus of treatment. If the cause is emotional or psychological, your healthcare provider may counsel you or refer you to a therapist for evaluation and counseling.

If new fatigue is caused by worsening heart health, prompt recognition and treatment of heart disease may prevent a heart attack.

How can I take care of myself?

  • Get enough rest and sleep. Do things to help you sleep better. For example, keep a regular bedtime routine. Avoid caffeine and smoking. Relax and have some quiet time before going to bed. Get help for problems that disrupt your sleep.
  • Eat a healthy diet. If you are overweight, begin a weight loss program after checking with your healthcare provider. When you are overweight, it takes more energy to move about. You become tired more easily
  • Work on improving your physical fitness. Walk or exercise according to your healthcare provider’s recommendations. Exercise can increase your energy, improve your mood, and help you sleep better.
  • Plan to do activities during the time of day when you have the most energy.
  • Take naps.
  • Learn to use deep breathing techniques, visualization, and meditation to relieve stress.
  • See a counselor if you are having emotional problems or family or work-related stress.
  • Allow yourself time to relax and do things you enjoy.
  • Meet new people and develop new interests.

How can I prevent fatigue?

  • If you are working longer hours or doing more physical work than usual, allow yourself more time to sleep or rest.
  • If your work activity has become more strenuous, take breaks during the day to sit and rest or to walk around if your work requires staying in the same position.
  • Ask your provider about taking vitamin and mineral supplements.
  • Consider eating smaller meals 4 to 6 times a day if that seems to help you maintain a higher energy level. Eat more complex carbohydrates, such as whole grains (flour, rice, and pasta made from whole grains), and eat less fat. Avoid foods that contain a lot of sugar. Avoid overeating.
  • Stop smoking.
  • Avoid caffeine, alcohol, and other drugs. In addition to their other negative effects, they can keep you from sleeping well.
  • Exercise regularly according to your healthcare provider’s recommendation.
Developed by RelayHealth.
Adult Advisor 2015.1 published by RelayHealth.
Last modified: 2013-02-12
Last reviewed: 2013-01-29
This content is reviewed periodically and is subject to change as new health information becomes available. The information is intended to inform and educate and is not a replacement for medical evaluation, advice, diagnosis or treatment by a healthcare professional.
Copyright ©1986-2015 McKesson Corporation and/or one of its subsidiaries. All rights reserved.

Patient Portal

Our Patient Portal provides safe and secure online access to better communicate with your Tufts Medical Center Community Care doctor. This easy-to-use web tool is a convenient way to book appointments, request referrals, renew prescriptions, view medical records/test results and communicate with your healthcare provider from the privacy of your own computer.


Your privacy is important to us. Learn more about ourwebsite privacy policy. X