Most Common Diseases in The World

A disease is an abnormal condition that affects the body of an organism in a negative way. There’s a huge range of Most Common Diseases in the World, from serious to not-so-serious or from common to rare and deadly diseases. 

If we put in words the number of diseases that are known to the world than it’s a list of something near 10,000 diseases. Although that’s not it to the amount of disease. As the amount keeps on increasing with time as everyday a new disease is being discovered by people around the world.

So no fixed digit of diseases can be finalized because there’s no end to it really.

Causes Of The Diseases

If we come to the causes of the diseases than every disease from a common or not so serious disease to a rare or deadly one; have different causes and reasons for it. But the very common reason that makes us fall prey to any kind of disease is simply our lifestyle. 

Falling prey to the new and advanced era. We forget to develop and maintain our healthy lifestyle and way of living and staying completely hygienic. When it comes to our body and health

These are the main factors that cause most of the diseases to affect us, as it all starts from the unhealthy, unhygienic or unbalanced lifestyle we tend to follow nowadays. 

Now that we’re talking about all the diseases in the world today, without further ado let’s just move to its types and the most common diseases known in the world.

Types of Diseases:

There’s a humongous list of diseases in the world, in which most are either unknown or left untreated by people due to less severity. Although the list of diseases is no short and can’t be discussed at a time; but there four basic types of diseases which include;

  • infectious diseases
  • Deficiency diseases
  • Heredity diseases
  • Physiological diseases
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How Many Most Common Diseases in The World?

Hepatitis B:

Hepatitis B, as known is; is a disease of the liver. The disease causes scarring of the organ and leads to further liver failure and, then even cancer. The disease is although pretty common but can even lead to becoming fatal if, by any chance, it is left untreated. 

This disease can spread from someone who is already affected by Hepatitis B. It usually spreads through either contact with someone else’s blood or open sores, or through contact with the body fluids of someone who is already affected with this virus.

Although Hepatitis B has no certain cure to it, it can be prevented with a vaccine. Following certain methods of precaution helps in keeping others away from being affected by this virus. 

Now, the question remains if you can get cured of this virus or not then there are certain cases where most adults recover from this disease, even though they face serious symptoms or signs of Hepatitis B.


The disease of malaria is caused by a parasite, which is transmitted to the human body through the bites of mosquitos that are infected. These parasites multiply in the liver of the person’s body before they attack the red blood cells of the bloodstream in the body. 

With time, when the disease increases furthermore, the person’s liver and spleen enlarge. Malaria causes a person to feel seriously sick, causing high fever and a chilled shaking body

Increasing of malaria can also cause a person to get infected with anemia or jaundice. But that’s not all, as Malaria may also affect the brain of the person and cause neurological issues.

Hepatitis C:

Hepatitis C is another disease that is caused due to the Hepatitis C virus. And causes liver damage which can moreover lead to liver damage. Not just that, but Hepatitis C also leads to liver cancer and lymphomas in the human body. 

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Basically it is caused when the Hepatitis C virus infects the liver causing liver inflammation. Just like Hepatitis B, this disease can also spread from one person to the other. Only if someone comes in contact with the infectious fluids and secretions of someone who is already affected by this virus.

Hepatitis C can be cured if 3 months after the completion of the treatment. The person’s blood is not detected with this virus; after it is measured through a blood test.

Now, when it comes to the differentiating between both the Hepatitis B and C. Then Hepatitis C is considered more durable in terms of Hepatitis B. As a Chronic Hepatitis B may be manageable but not curable.


This one’s simply caused by a mosquito bite. As it is a mosquito-borne tropical disease that is caused due to the dengue virus. The symptoms of this disease come to notice after some three to fourteen days. After the infection takes place inside our body. 

Its symptoms include headache, high fever, vomiting, joint and muscle pains, and a skin rash. The dengue virus known as the DENVs consists of 4 serotypes (DENV 1-4). Although there is no cure to dengue, an early diagnose and proper medical treatment may lower the rate of fatality by 1%.

Dengue virus is most likely to be found in tropical and sub-tropical climates, all around the world. And has now become one of the leading causes of the death of children in some Asian and American countries.


This disease is caused by a specific bacteria, known as Mycobacterium tuberculosis. This bacterium mostly attacks the lungs of the body, but can also affect other parts too. 

IT is simply transmitted from one person to the other through the air. The transmitting of this disease can take place through sneezing. Coughing or even talking of someone who already has TB or tuberculosis.

As much as this disease is common, it is equally life-threatening and contagious too. Although it is curable permanently, it needs early diagnosis and proper treatment, otherwise, it can lead to the person’s death.