How many life-threatening diseases are there?

It is not possible to provide a precise number for the total number of life-threatening diseases, as the definition of "life-threatening" can vary depending on the specific context and criteria used. However, some common life-threatening diseases include:

- Cardiovascular diseases: such as heart attacks and strokes

- Cancers: including lung cancer, breast cancer, and colon cancer

- Chronic respiratory diseases: such as chronic obstructive pulmonary disease (COPD) and asthma

- Diabetes: in its severe forms, particularly when complications such as heart disease, stroke, kidney failure, or blindness occur

- Infectious diseases: such as tuberculosis, malaria, and HIV/AIDS

- Neurodegenerative disorders: such as Alzheimer's disease and Parkinson's disease

- Liver diseases: such as cirrhosis and liver failure

- Kidney diseases: such as chronic kidney disease and kidney failure

It's important to note that this list is not exhaustive and there are many other conditions that can be life-threatening under certain circumstances. The prevalence of life-threatening diseases can also vary depending on geographic regions, demographics, healthcare systems, and socioeconomic factors.