How do you define illness?

Answer 1

1.
organic breakdown or deterioration (e.g., tooth decay, heart failure, senility)

2.
obstruction (e.g., kidney stones, arterial blockage due to plaque build-up)

3.
injury (e.g., broken bones, bullet wounds)

4.
imbalance (e.g., too much or too little of specific hormones and salts in the blood)

5.
malnutrition (e.g., too much or too little food, not enough proteins, vitamins, or minerals)

6.
parasites (e.g., bacteria, viruses, amoebas, worms)