What are the 4 Types of Diseases?

Disease is a disruption in the normal functioning of the body or mind, often characterized by specific symptoms and signs. It can stem from various causes, including pathogens, genetic factors, lifestyle choices, and environmental influences. Four types of diseases:

1. Infectious Diseases: Caused by pathogens such as bacteria, viruses, fungi, or parasites, which can spread from person to person.
2. Hereditary diseases are conditions caused by genetic abnormalities passed down from parents to their offspring. These diseases are characterized by alterations in the DNA sequence and can affect various aspects of health and development. Examples include cystic fibrosis, Huntington’s disease, and sickle cell anemia.
3. Deficiency diseases result from a lack of essential nutrients in the diet, leading to specific health problems. They often occur when the body doesn’t receive enough vitamins, minerals, or other vital nutrients necessary for proper functioning. Examples include scurvy (vitamin C deficiency), rickets (vitamin D deficiency), and anemia (iron deficiency).
4. Physiological diseases refer to conditions that arise from abnormalities or dysfunctions in normal bodily functions or processes. These diseases typically involve disruptions in the functioning of organs, tissues, or systems, often without a clear infectious or genetic cause. Examples include hypertension (high blood pressure), diabetes mellitus (impaired insulin function), and asthma (chronic inflammation of the airways)

Relevant Links:

• Types of Diseases
• Diseases – Definition, Classification, Types and Causes
• Microbes and Disease
• NCERT Notes on Class 12 Biology Chapter 7 – Human Health and Disease
• Difference between Acute and Chronic Diseases