Figure 4. The frequencies of hypertensive patients suffering cephalic symptoms and their correlations with palpitation (n = 800). The percentages of patients suffering dizziness (A), daze (B), headache (C), and tinnitus (D). The analysis of cross-classification of palpitation and dizziness (E), palpitation and daze (F), palpitation and headache (G), and palpitation and tinnitus in patients with hypertension (H).