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10 causes of fatigue

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Fatigue is a symptom characterized by severe exhaustion and tiredness. A person can undergo psychological fatigue or physical fatigue or both at the same time. Apart from tiredness, it makes one lazy, drowsy and instils apathy and lack of interest towards any kind of activity.

We decipher the 10 most obvious causes behind fatigue.


Bad lifestyle is one of the most common causes of fatigue. Going to sleep late night, indulging in alcohol and drugs, stress, anxiety and depression drain off energy from the body leaving one in a state of utter exhaustion. Relationship issues, work pressure, and even lack of physical activity lead to severe mental fatigue.

2.Side effects of drugs and treatment

Fatigue is a side effect of several drugs and therapies. Anti-depressants, anti-anxiety pills, sedatives, anti histamines, etc. cause fatigue and drowsiness. Similarly, radiation therapies and chemotherapies also induce considerable fatigue and weakness in the body.

3.Underactive thyroid

This is one of the common reasons behind women feeling excessively tired and sleepy. Underactive thyroid entails low levels of the hormone thyroxine in the body that leads to weight gain, muscle pain and fatigue.


Deficiency in iron leads to anaemia. You will constantly feel weak, dizzy and nauseous no matter how much food you eat. Furthermore, it’s more common in pregnant women and those with heavy menstrual flow.

5.Sleeping problems

How do you feel the next morning when you don’t have a proper sleep in the night? Tired, drowsy, irritated and exhausted; isn’t it? A person succumbs to sleep disorders on not having sound sleep regularly. Sleep apnoea, insomnia, stress, hypertension, etc. are responsible for sleep problems which in turn lead to fatigue.

6.Chronic Fatigue Syndrome

As the name suggests, it’s a condition of unexplained fatigue for a long time that can extend beyond six months. Doctors suspect several medical conditions like infections, psychological stress, etc responsible for chronic fatigue syndrome. Along with extreme fatigue, the person might experience pain in joints, headache, sore throat, etc.

7.Cardiac and Pulmonary Disease

Problems in the heart and lungs are bound to make you feel fatigued and they include coronary heart disease, arrhythmias, congestive heart failure, COPD, asthma, pneumonia, etc. Shortness of breath and severe tiredness are experienced under such circumstances.


Diabetes patients suffer from extreme fatigue due to high blood glucose levels in the blood. They feel drowsy, tired along with the need to urinate frequently. The fatigue usually comes from physical exertion or even while performing mild tasks.

9.Nutrition deprived

Is the food you are eating is devoid of healthy carbohydrates and vitamins and minerals? Well check your diet then. Deficiency of vitamin c, potassium and magnesium is largely responsible of fatigue. Furthermore, eating heavy foods like white flours and junk foods also take a toll on your body’s energy level.


Fatigue can occur from kidney and liver disease. People suffering from restless leg syndrome suffer severely from fatigue. Obesity and overweight deprive one from being active and agile. Several infections like viral fever, celiac disease, diarrhoea, AIDs, tuberculosis, etc. bring about substantial fatigue and weakness.

Those who are experiencing tiredness and fatigue can very well relate to the underlying causes. However, we suggest you to get a health check up done to overcome the problem and get all your energy back. Good luck!

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Written by: Saptakee sengupta
Date last updated: January 11, 2015