Lesson 1 Introduction

According to the World Health Organisation (WHO), Health is:

“a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity”.

Physical health (ability to maintain health or recover to a healthy state after disease) is the main focus of this unit.

• Diseases can influence, change, or even disrupt some of your body functions, including even after recovery.
• Diseases can even influence your mental and social well-being.

Diseases can be classified based on the way someone can get them