Top 20 Deadliest Diseases That Attack Humans

Top 20 Deadliest Diseases That Attack Humans

The world is becoming a tough place to live and survive. With so many deadly diseases humans are actually fighting hard to stay healthy. There is no discrimination in religion, caste, creed or sex when it comes to diseases and its fatality.

Recently, a survey was done and they found out top 20 deadliest diseases that attack humans, which can even bring death. The fatality rate of the below listed diseases were very high. Now, let us have a look at the diseases ad their symptoms.


Ebola is caused by Ebola virus. Fever, sore throat, muscle pain and headaches are the main symptoms of this disease. The disease occurs after two days and in three weeks once attacked by the virus. Internal and external bleeding can also occur. It has a fatality rate of 90 percent. The virus spreads by direct contact with blood or other body fluids of an infected human or other animal. Efforts are on its process to develop a vaccine for this deadly disease.


This disease almost killed 500 million people. It was declared eradicated in 1977 after WHO introduced a vaccination. Still it is considered one of the most deadliest diseases.

Yellow Fever

This disease is most common in America and Africa. It is spread by mosquito bites.   Roughly 30,000 people die every year due to this disease.


This disease attacks the lungs at first which is later spread to other organs including brain, spine and kidneys. Almost 1.3 million people died in the world that was attacked with Tuberculosis.


Measles is a highly contagious respiratory disease. It is cured to an extent due to the vaccination but, reports claim that some parts of Africa, Asia and Mediterranean are still attacked by the disease.

Lung Cancer

Smoking is regarded as one of the most crucial reason for lung cancer in humans. Almost 1.38 million deaths are reported each year due to lung cancer.


A Cholera affected person will suffer from severe vomiting and diarrhea. It can cause to the death of the person within few hours after attacked by the virus. It is dominant in countries where there is lack of clean water.


Malaria is caused again due to mosquitoes. Once attacked, it should be well treated otherwise it can lead to death. Sub Saharan Africa is the most affected country with the disease.

Spanish Flu

It is regarded as one of the most fatal epidemics that had killed more than 30 million people in 1918 and 1919.

Chronic Lung Disease

According to the latest studies by WHO, bronchitis and emphysema will be the third leading diseases causing death by the end of 2030.


HIV is curable if detected at an early stage. But, if detected at the last stage, then it is very difficult to get cured.  It took the lives of more than 39 million people worldwide.


The bacteria affect the membranes surrounding the brain and the spinal cord. It usually affects the aged group and those after 30 yrs. Even detected early, there are chances of 5-10 percent fatality rate.

SARS (Severe Acute RespiratorySyndrome)

This disease got spread to 37 countries within a few weeks. More than 8000 people got affected and almost 800 died due to this.

Cardiovascular Diseases

Cardiovascular diseases are the world’s biggest killer according to a latest report. Three out of every 10 people affected die due to this disease.

Bubonic Plague

This deadly disease killed almost 25 million people during the Middle Ages.

Whooping Cough

It affected almost 18 million people in 2008. Almost two lakh children in developing countries were attacked by this disease.

Avain Flu

This is yet another fatal disease announced in 2003. It is popularly known as bird flu.

Influenza A-H1N1

Commonly known as swine flu, this is yet another deadliest disease.


Leprosy is curable to an extent but it takes time. But, if attacked, the person is considered as an outcast. The disease affects the skin and the nerves.


This is one of the most dangerous STD.  It can either lead you o death or it can affect your brain or heart, leading to complications. Almost 12 million people suffer from this disease every year.

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