Is Blood Pressure Higher in the Morning? The Morning Surge Explained

01Rhythm

The daily rhythm of blood pressure

Blood pressure follows a circadian rhythm. It is lowest during deep sleep, begins rising in the early hours, increases sharply around waking and usually stays higher during the day, with a smaller dip in the afternoon and a fall in the evening. People whose blood pressure does not dip at night (“non-dippers”) have a higher cardiovascular risk.

02Why

Why it rises in the morning

• Hormones such as cortisol, adrenaline and renin rise before waking.
• The sympathetic nervous system becomes more active.
• Getting up and moving increases heart rate and blood pressure.
• Blood is slightly thicker and more likely to clot in the morning.
• Blood pressure medicines taken the previous morning may be wearing off.

03Risk

Why the morning surge matters

Heart attacks and strokes occur more often in the morning hours. Research in older adults with high blood pressure found that those with the largest morning surge had more strokes and silent brain damage, independent of their average blood pressure. This is why doctors pay attention to morning readings and to whether medicines control blood pressure over 24 hours.

04Other causes

Other reasons for high morning readings

• Alcohol in the evening, which can cause a rebound rise.
• Poor sleep, insomnia or shift work.
• Sleep apnoea: snoring, gasping, morning headaches and daytime tiredness; see morning headaches.
• High salt intake in the evening meal.
• Measuring straight after waking, rushing, or with a full bladder.
• Anxiety about measuring.

05Measuring

How to measure your blood pressure at home

• Use a validated upper-arm monitor with the right cuff size.
• Measure in the morning before taking medicines, eating, drinking coffee or exercising, and after using the toilet.
• Sit quietly with your back supported, feet flat and arm resting at heart level for 5 minutes.
• Take two readings one minute apart.
• Repeat in the evening, for at least 4 to 7 days.
• Record all readings and discuss the average with your doctor.

In general, a home average of 135/85 mmHg or above is considered high.

06Diet

Diet to help control blood pressure

The DASH diet, rich in fruit, vegetables, wholegrains, pulses, nuts, low-fat dairy and lean protein, and low in salt, saturated fat and added sugar, lowers blood pressure. Reducing salt to less than about 5 to 6 g a day, choosing potassium-rich foods such as bananas, leafy greens, beans and potatoes, and limiting processed foods make a measurable difference.

See DASH diet for high blood pressure and 7-day diet plan for high blood pressure.

07Evening

Evening habits that help morning readings

• Keep dinner moderate in salt and avoid very salty snacks late at night.
• Limit alcohol, especially in the evening.
• Aim for 7 to 9 hours of regular sleep.
• Wind down with relaxation or slow breathing; see breathing exercises for blood pressure.
• Treat snoring and possible sleep apnoea.

08Medicines

Medicines and timing

Some people with high morning readings benefit from long-acting medicines or from changing the time they take them, but large trials have shown mixed results on whether evening dosing is better. Never change the timing or dose of medicines without talking to your doctor. Take them consistently every day.

09Lifestyle

Other lifestyle measures

• At least 150 minutes of moderate activity a week.
• Maintain a healthy weight.
• Stop smoking.
• Manage stress.
• Limit caffeine if it raises your readings.

11Summary

Key points to remember

• Blood pressure normally rises in the early morning.
• An exaggerated morning surge is linked to higher stroke and heart risk.
• Measure at home morning and evening, before medicines and coffee.
• Diet, exercise, sleep and limiting alcohol and salt help.