There are four major types of diseases. They are infectious diseases, deficiency diseases, hereditary diseases, and psychological diseases.
Infectious diseases: Infectious diseases are the ones that can spread to another person easily. It can be through physical touch, through the air or through various other means. The best example of infectious disease is the common cold.
Deficiency Diseases: Deficiency diseases are the ones that are caused by the deficiency of nutrients. Deficiency of different nutrients causes various diseases. Some of the common diseases caused by vitamin deficiency are Pellagra which is caused by the deficiency of vitamin B3 and Paresthesia is a disease that is caused by the deficiency of Vitamin B5.
Something you would never guess is vegan they doesn't consume any animal-derived foods.
Hereditary disease: Hereditary diseases are the ones that are caused by the genes. Some of the examples of hereditary diseases are heart disease, diabetes, arthritis and cancer
Psychological disease: The disease that affects the mental health of a person is called psychological diseases. Some examples of psychological diseases are clinical depression, anxiety disorder, bipolar disorder, and multiple personality disorder.
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