Common diseases

In 2016, the 25 most frequently used ICD-10 diagnostic codes were:

1. Hypertension
2. Hyperlipidemia
3. Diabetes
4. Back pain
5. Anxiety
6. Obesity
7. Allergic rhinitis
8. Reflux esophagitis
9. Respiratory problems
10. Hypothyroidism
11. Visual refractive errors
12. General medical exam
13. Osteoarthritis
14. Fibromyalgia / myositis
15. Malaise and fatigue
16. Pain in joint
17. Acute laryngopharyngitis
18. Acute maxillary sinusitis
19. Major depressive disorder
20. Acute bronchitis
21. Asthma
22. Depressive disorder
23. Nail fungus
24. Coronary atherosclerosis
25. Urinary tract infection

So we see:

11/25 are diseases of affluence, related to obesity and advanced age:

1. Hypertension (obesity, advanced age)
2. Hyperlipidaemia (obesity, advanced age)
3. Diabetes (type 2: obesity, advanced age)
4. Back pain (obesity, advanced age)
5. Obesity
6. Reflux oesophagitis (obesity, advanced age)
7. Hypothyroidism (often iatrogenic, advanced age)
8. Respiratory problems (when related to smoking)
9. Visual refractive errors (advanced age)
10. Osteoarthritis (obesity, advanced age)
11. Pain in joint (obesity, advanced age)
12. Coronary atherosclerorsis (obesity, advanced age)

6/25 are infectious diseases:
Air pollution is often related to the following respiratory complaints. 

1. Respiratory problems (usually viral, often bacterial, often allergic, sometimes fungal)
2. Acute laryngopharyngitis (usually viral, often bacterial)
3. Acute maxillary sinusititis (usually viral, often bacterial, often allergic, sometimes fungal)
4. Acute bronchitis (usually viral, often bacterial)
5. Nail fungus
6. Urinary tract infection (usually bacterial, sometimes fungal)

3/25 are mental health disorders, 1/25 is generally considered to have a somatic component:

1. Anxiety
2. Major depressive disorder
3. Depressive disorder
4. Fibromyalgia

2/25 are atopic, more common in affluent societies

1. Allergic rhinitis
2. Asthma