Caffeine and stress work synergistically to raise blood pressure. The effect is temporary in healthy people, but hypertensive or pre-hypertensive patients need to be careful.
Caffeine’s effect: raises BP 5–10 mmHg for 3–4 hours after intake. In rare drinkers the spike is bigger; daily drinkers develop tolerance.
Safe limits: healthy adults — up to 400 mg caffeine/day (≈4 cups of coffee); hypertensives — <200 mg/day; pregnant women — <200 mg/day.
Hidden caffeine: green/black tea (40–70 mg), energy drinks (80–300 mg), cola (30–40 mg), dark chocolate (12 mg/30 g), some headache medications.
Work stress: raises cortisol and adrenaline → chronic BP elevation. High caffeine + high stress is a recipe for hypertension.
Tips: no caffeine after 2pm, deep-breathing during stress peaks, schedule >5-minute breaks between meetings, monitor BP regularly.