Understanding Health and Disease Interactions Revision Notes | GCSE OCR Foundation Biology

What this lesson covers

Explore what health means and how different types of diseases can interact with each other, including the effects of immune system defects, viral trigge...

• Explain the relationship between health and disease
• Describe how different types of disease interact with each other
• Evaluate the impact of physical health on mental wellbeing
• Analyse how immune system defects increase disease susceptibility

Key ideas to keep in view

Use this lesson to stay inside B6.3 Monitoring and maintaining health while connecting the detail back to the wider B6: Global challenges topic.

• B6: Global challenges
• B6.3 Monitoring and maintaining health
• GCSE OCR Foundation Biology

Lesson notes preview

Read the core explanations from Understanding Health and Disease Interactions before testing yourself from memory.

• When someone asks if you're healthy, what comes to mind? Most people think about not having a cold or broken bones. But health is much more complex than that.
• Health is the state of physical and mental wellbeing. It's not just the absence of disease - you can be disease-free but still not healthy if you're stressed, malnourished, or mentally unwell.
• Think of health like a balanced scale. On one side, you have factors that promote wellbeing: good nutrition, exercise, social support, adequate sleep. On the other side, you have factors that damage health: disease, stress, poor diet, isolation.
• This balance is constantly shifting. A person might be physically fit but struggling with depression. Another might have diabetes but manage it so well they feel great mentally and physically. Health isn't black and white - it's a spectrum.
• Diseases fall into two main camps, and understanding the difference is crucial for your exams. The key is in the name: can it be communicated (passed on) or not?
• A disease caused by pathogens (bacteria, viruses, fungi, or parasites) that can be transmitted from one organism to another through direct contact, air, water, or vectors.
• Examples: COVID-19, tuberculosis, malaria, athlete's foot. These spread because the pathogen can survive outside the host and infect new people.
• A disease that cannot be transmitted between organisms. Usually caused by genetic factors, lifestyle choices, environmental factors, or age-related changes.
• Examples: Heart disease, diabetes, cancer, arthritis. You can't 'catch' diabetes from someone - it develops due to genetics, diet, exercise levels, and other personal factors.
• Here's where it gets interesting - and where exam questions get tricky. Diseases don't exist in isolation. Having one disease often makes you more likely to get another, or makes existing diseases worse.

Continue through the topic

Move to the related lessons or back to the topic page when you need the wider sequence before exam-style practice.