Table 3.

 Symptoms most widely associated with hypertension

Symptom	Countries (No of studies)
Headache	Brazil (4), Canada (1), Denmark (1), Ghana (1), Netherlands (2), South Korea (1), Sweden (2), UK (2), USA (8)
Dizziness	Brazil (3), Canada (1), Denmark (1), Ghana (1), Netherlands (1), New Zealand (1), South Korea (1), Sweden (1), Tanzania (1), Thailand (1), UK (3), USA (9)
Palpitations/racing heart	Brazil (3), Canada (1), Netherlands (1), Sweden (1), Tanzania (1), USA (3)
Sweating	Brazil (1), Canada (1), Netherlands (1), Tanzania (1), UK (1), USA (1)
Tiredness	Brazil (3), Canada (1), Denmark (1), Ghana (1), Sweden (2), UK (1), USA (2)
Neck pain	Brazil (3), South Korea (1), Spain (1), USA (2)
Nausea/vomiting	Brazil (2), Spain (1), Thailand (1), USA (1)
Chest pain	Brazil (2), Canada (1), UK (1), USA (1)
Visual changes	Brazil (1), Canada (1), UK (1), USA (4)
Feeling nervous/irritable	Brazil (2), USA (2)