Disease & Disorder Health

A Quick Overview of the 4 Major Types of Diseases

We all want to know more about the diseases that are out there. This article will briefly discuss each major type of disease, how they are transmitted, and what the symptoms are. It will also include a brief overview on how to identify that you or someone has any of these diseases.


Although there are over a thousand types of diseases, they can be categorized into one of four major groups: infectious diseases, metabolic diseases, genetic diseases, and chronic degenerative diseases. Diseases that fall under the category of “infectious” include everything from the common cold to HIV/AIDS. Those that fall under the category “metabolic” may have a hereditary component or an environmental cause. Genetic disorders involve an error in a person’s DNA or chromosomes. Finally, chronic degenerative diseases refer to any disorder that gradually worsens over time and includes illnesses such as Alzheimer’s disease and cancer.

What are the 4 types of diseases?

There are four main types of diseases: infectious, genetic, cancerous, and viral. Infectious diseases are caused by bacteria or viruses that invade your body – think the common cold or strep throat. Genetic diseases are passed down by family members through their genes. Cancerous diseases are caused when cells in your body divide uncontrollably, which can lead to dangerous tumors called carcinomas. Viral diseases are also caused by a virus but they’re often less dangerous than other kinds of disease because they can’t be passed on to others.

Parasitic Diseases

Parasitic diseases are caused by any one of a variety of parasites. These parasites live in the human body and feed on its nutrients, which can lead to a number of different symptoms. This can include anemia, various organ damage, and even death.

Parasites have been around for as long as humans have been alive. In fact, it is believed that the earliest forms of life on earth were parasitic organisms as they are so diverse and adaptable.

Bacterial Diseases

Bacterial diseases are caused by different types of bacteria. They are usually transmitted to humans through contact with surfaces or people who are infected. The symptoms range from mild (a runny nose) to severe (sepsis). Treatment for bacterial diseases often includes drugs like penicillin or amoxicillin.

Viral Disease

Viruses are the simplest type of organism. They multiply simply by injecting their genetic material into a host cell. When they do this, there is the chance that the host cell will mutate and become much like the virus. This causes an endless cycle of infection because the only way to stop viruses is to kill all cells with which it has come in contact with.

Protozoa Disease

Protozoa diseases are transmitted by water contaminated with feces. Areas where this is common include places with poor sanitation, rural communities without a sewage system, and places that have been hit by natural disasters. The most commonly found protozoal parasites are “Giardia lamblia” and cryptosporidium.


The types of diseases that need to be identified are mainly cancer, cardiovascular disease, diabetes, and chronic lung disease. These are the leading causes of death worldwide and require medical attention as soon as they are detected. Early detection is the key to treatment success.

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