You need to be able to describe the relationship between health and disease and the interactions between different types of disease.
Health is the state of physical and mental well-being. Diseases, both communicable and non-communicable, are major
causes of ill health. Other factors including diet, stress and life situations may have a profound effect on both physical and mental health.
Different types of disease may interact:
- Defects in the immune system mean that an individual is more likely to suffer from infectious diseases.
- Viruses living in cells can be the trigger for cancers.
- Immune reactions initially caused by a pathogen can trigger allergies such as skin rashes and asthma.
- Severe physical ill health can lead to depression and other mental illness.