Everybody dreads illnesses and diseases, and there are many deadly illnesses in the world that not only affect physical health but also break the sufferers down emotionally, often proving to be fatal. Some of the top 5 deadliest diseases of mankind are:
 

HIV/AIDS:

Every person in the world is aware of AIDS, one of the top deadliest diseases of mankind and affecting around 39.4 million people in the world. HIV or the human immunodeficiency virus infects a person with deadly consequences, impairing the patients’ immune system functioning, making suffers susceptible to infections. Though there are some retroviral drugs available for this deadliest disease of mankind, yet the absolute cure has not yet been discovered.
 

Ischemic Heart Diseases

Any dysfunction in heart or its inability to maintain proper blood circulation leads to deadly consequences. No surprise, heart diseases are one of the top five deadliest diseases in the world, affecting 7.25 million of people in the world. Congenital heart disease, coronary heart disease, and hypertensive heart disease are the top most deadly form of this disease. Antiplatelet drugs and anticoagulants are helpful in treating this deadly heart condition.
 

Cerebrovascular Diseases

This is a deadly condition in which the vascular system of the brain is affected adversely, often proving fatal for the sufferers. One of the top 5 deadliest diseases, cerebrovascular condition affects 6.56 million patients. Smoking, alcohol consumption, diabetes, and hypertension are the major causes of this deadly disease of mankind. Though there are no treatments for reversing the damage, the available drugs can control the symptoms.
 

Diarrhea

One of the top 5 deadliest illnesses of the world, diarrhea affects more than 4 million people. Acute stomach pain with frequent loose bowel movements caused by microscopic worms and the bacterial infections defines a person suffering from diarrhea. Though this deadly disease has the cure, it might be fatal if not treated at early stages.
 

Lower Respiratory Diseases

This is another deadly condition among the top 5 deadliest diseases in the world, affecting 3.46 million of people. Pneumonia and various other pulmonary illnesses are considered one of the deadliest diseases of mankind. Annually, about 4 million deaths are caused by these deadly lower respiratory diseases in the world.