The number one worldwide infectious disease killer is tuberculosis (TB).
Tuberculosis is the deadliest infectious disease in the world. Why is it so dangerous, and what are the symptoms? A stubborn cough can be a sign of tuberculosis or TB. Tuberculosis is still around, and cases have been on the rise in recent years in Colorado and around the U.S. Photo: Getty Images.
Globally, TB is the world's leading cause of death from a single infectious agent and among the top 10 causes of death. TB was also both the leading killer of people with HIV in 2024 and a major cause of deaths related to antimicrobial resistance.
Leading Causes of Death
"Big Three" Infectious Diseases: Tuberculosis, Malaria and HIV/AIDS.
In a world of conflicting headlines and confusing research, people constantly wonder if there is anything they can do to improve their chances of avoiding the big four diseases—cancer, heart disease, diabetes and dementia/Alzheimer's.
The number one killer in the world is cardiovascular disease (CVD), including heart disease and stroke, responsible for about one-third of all global deaths, claiming nearly 18-20 million lives annually, and remains the leading cause across all regions, according to WHO and World Heart Federation. While COVID-19 caused significant deaths in recent years, CVD has consistently held the top spot for decades, with increases seen globally, especially in younger populations.
Medical conditions that still remain incurable
What are the 10 most common diseases?
Cardiovascular Disease
CVD is a leading cause of death in Australia, affecting about 5% of the population. Risk factors include high blood pressure, high cholesterol, smoking, obesity, and lack of exercise.
Some of the most common infectious diseases are:
7 Deadliest Diseases in History: Where are they now?
Record numbers of men and women globally are now estimated to have reduced kidney function, a new study shows. Figures rose from 378 million people with the disease in 1990 to 788 million in 2023 as the world population grew and aged, making it for the first time a top 10 cause of death worldwide.
The agents that cause disease fall into five groups: viruses, bacteria, fungi, protozoa, and helminths (worms). Protozoa and worms are usually grouped together as parasites, and are the subject of the discipline of parasitology, whereas viruses, bacteria, and fungi are the subject of microbiology. In Fig.
Medical professionals call high blood pressure, also known as hypertension, the silent killer because it can go undetected for a long period of time and leads to death. Most people who have high blood pressure do not have any symptoms; testing is the only way to determine if someone has it.
Necrotizing Fasciitis
This is a very dangerous bacterial skin infection that can kill the victim within a short period of time. It is popularly known as flesh eating bug because of its ability to speedily spread through the body and kill the body's soft tissue.
Abstract. The six killer diseases, malaria, tuberculosis, measles, acute lower respiratory infections, diphtheria, and whooping cough, represent the most significant contributors to the overall global burden of disease.
Taken together, heart diseases and cancers are the cause of every second death. In red are infectious diseases, which are responsible for around 1-in-7 deaths. These include pneumonia, diarrheal diseases, tuberculosis, HIV/AIDS, and malaria. A smaller share – around 4% – was from neonatal and maternal deaths.
Top Countries With Highest Death Rates
5 Most Expensive Diseases
As we grow older, there is an increase in the risk of developing hypertension (high blood pressure), high blood sugar levels, high levels of body and blood fats. These conditions can lead to Non- Communicable Diseases like- heart and blood vessel diseases (stroke), diabetes, cancer, respiratory problems, etc.
Lung, bowel, breast and prostate cancers together accounted for almost half (45%) of all cancer deaths in the UK in 2017-2019. Around a fifth of all cancer deaths are from lung cancer.