What Causes Fatigue?

Do you constantly complain about tiredness and fatigue? Do you find it difficult to get out of bed and carry out the day-to-day tasks?

We all know that viral and bacterial infections often make us feel the same way. The tiredness associated with an infection lasts for some days. But if it lasts for a long time, it can be an indicator of some other underlying health condition.

If you have a complaint of long-lasting fatigue and tiredness, you must consult a healthcare provider. To get an expert opinion, you can visit the best Internal Medicine doctor in Lahore.

 In this article, we will tell you the reasons that may be causing you fatigue and lethargy. 

What Causes Fatigue?

Fatigue is a long-lasting feeling of tiredness, like missing sleep for a long time. You may feel that you do not have enough energy to carry day to day activities with zest and zeal. It may be a difficult task for you to get out of bed and do house chores or go to your job.  

There can be various causes for fatigue. They can be described as;



Allergy causes runny nose or congestion along with mucus buildup in the upper respiratory tract and cough. It can also be accompanied by a runny nose.

Allergy is a condition of your immune system when it gets hyperactive against a certain trigger. It can cause fatigue and lethargy.

To treat allergy, your healthcare providers may administer steroids- oral, nasal, or inhaled, and antihistamines.



A common reason for fatigue and lethargy is anemia. It is a condition in which your blood lacks enough healthy red blood cells.

The symptoms of anemia are breathlessness on exertion, dizziness, cold hands, and fatigue.

Your red blood cells carry oxygen, bound with hemoglobin. When your body lacks them, the oxygen supply to your organs is affected. 

Anemia can occur due to various reasons. To treat it, your healthcare providers will rule out the underlying cause and prescribe treatment according to it. 

Mostly, anemia occurs due to iron deficiency. Therefore your healthcare providers will administer iron supplements to treat fatigue associated with lethargy. Other causes for anemia can be folic acid, vitamin C, and vitamin B 12 deficiency. 



Depression can be the root cause of fatigue and lethargy. Other symptoms of depression are sadness, hopelessness, and a feeling of despair. 

Depression is more common in women compared to men. Often it occurs between the ages of 15 to 30. 

In women of reproductive age, depression is often associated with periods, and childbirth- known as postpartum depression. Sometimes postpartum depression gets better on its own with support and psychotherapy. However, if it does not get any better, you must consult with a healthcare provider. Postpartum depression, if it lasts long, can lead to various complications. 

Anxiety can also cause you to feel low and lethargic, accompanied by other symptoms such as trouble sleeping, agitation, worrying too much, and nervousness. 

If you feel tired because of anxiety and depression, you will feel better if you take medications for it. To get rid of tiredness, treating the underlying causes is essential. 


Viral or bacterial infections can make you feel low and tired. Along with that, it can also cause fever and body aches. 

If you have a fever along with tiredness, you must consult with a healthcare provider soon. And make sure to do plenty of rest. 

Infections that can make you feel tired are pneumonia, coronavirus, typhoid, flu, hepatitis, cytomegalovirus, HIV, mononucleosis, tuberculosis, and others. 

The Bottom Line 

Tiredness and fatigue often occur due to some underlying cause. Therefore to get rid of it, your healthcare provider needs to treat the underlying cause.

If you have a complaint of long-lasting tiredness and fatigue, you must consult the doctor soon. To get an expert opinion, you can visit Best Internal Medicine Specialist in karachi.

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