Many
patients with hypertension firmly believe that "drinking more water can
dilute the blood and stabilize blood pressure." However, in clinical
outpatient settings, many individuals have experienced chest tightness, edema,
and even acute heart failure due to incorrect ways of drinking water or
insufficient water intake.
For individuals with hypertension who also suffer from coronary heart disease, kidney disease, cerebral infarction, or heart failure, the recommended water intake standards vary significantly.
Professor Zheng Yin, Vice President of Hainan Chengmei Hospital and a cardiovascular expert, has compiled a personalized hydration prescription for different groups based on clinical cases, to scientifically replenish water in summer and avoid misunderstandings that may harm the body.
Drinking water incorrectly can lead to vastly different outcomes
Real outpatient case
Three patients with hypertension, all taking standardized antihypertensive medications, differ significantly in their physical conditions solely due to their varying hydration habits:
① Lao Zhang (with hypertension and coronary heart disease)
Drinking a large amount of water all at once when going out can lead to a sudden increase in blood volume in a short period of time, which can exacerbate the heart's blood-pumping burden, resulting in frequent chest tightness and palpitations, and even triggering episodes of heart failure;
② Lao Li (hypertension with renal insufficiency)
Believing in the myth of "drinking plenty of water to detoxify", some individuals consume over 3000ml of water daily, causing their kidneys to be unable to metabolize excess water in a timely manner. Consequently, they experience generalized edema, shortness of breath, and worsening heart failure.
③ Lao Wang (with simple hypertension, no complications)
Maintain a daily intake of 1500–2000ml of warm water, drinking in small amounts and at regular intervals. Drink water regularly in the morning to replenish fluids. This ensures long-term stable blood pressure and prevents any discomfort.
A small glass of water directly affects heart and kidney health. Hydration for people with hypertension cannot be generalized
For individuals with hypertension, it is important to distinguish between beverages that are safe to drink and those that are not
✅ Recommended for daily consumption
1. Warm boiled water/cold boiled water (preferred)
With a water temperature of 30–40℃, it is mild and non-irritating to blood vessels, and will not cause sudden contraction of blood vessels. It is a basic beverage suitable for all individuals with hypertension;
2. Light health tea
Light green tea, chrysanthemum tea, and cassia seed tea, when consumed in moderation, can help resist oxidation and clear liver fire. However, strong tea is strictly prohibited due to its high theophylline content, which can increase heart rate and cause significant fluctuations in blood pressure.
❌ Strictly avoid three types of beverages
1. Iced water, iced drinks
Low temperature stimulates vasospasm, and patients with coronary heart disease and cerebral infarction are prone to induce angina pectoris and dizziness after drinking;
2. Milk tea, sugary drinks
Added sugar elevates blood sugar levels and exacerbates vascular damage, which is not conducive to long-term blood pressure control;
3. Strong coffee, high-osmolarity functional beverage
Significantly increase heart rate, causing a short-term surge in blood pressure and exacerbating the heart's workload.
In a nutshell: Plain water is the best beverage for people with hypertension, with light tea as a minor accompaniment. Try to avoid iced drinks, sweetened drinks, and strong coffee.
Drinking water prescription tailored for six types of hypertension: Drink water as needed
1. Pure hypertension (without complications such as coronary heart disease, kidney disease, cerebral infarction, etc.)
Drink a total of 1500–2000ml of water daily, distributed in small amounts throughout the day; drink 200ml of warm water on an empty stomach in the morning to dilute the blood, and reduce water intake one hour before bedtime to avoid frequent nighttime trips to the bathroom that may disrupt rest.
2. Hypertension with coronary heart disease and previous myocardial infarction
The daily total intake should refer to that for ordinary hypertension. The core principle is to drink slowly and in small sips, and it is forbidden to gulp down water all at once. Ice water should be avoided throughout the process to prevent coronary vasospasm, which can induce chest pain and palpitations.
3. History of hypertension with cerebral infarction
Warm water in the morning is "life-saving water". During nighttime sleep, the human body continuously loses water, leading to an increase in blood viscosity, which is the core trigger of high incidence of cerebral infarction in the morning. Drinking 200ml of warm water immediately after getting up can dilute the blood and reduce the risk of thrombosis.
4. Hypertension with renal insufficiency and renal failure
Drinking water is strictly limited, and one should not blindly drink more. The total daily water intake = the previous day's urine output + 500ml; it is recommended to use a graduated water cup for precise measurement. Excessive drinking can cause water retention, leading to edema, increased blood pressure, and worsening heart failure.
5. Hypertension with heart failure
The water control standard is stricter than that for kidney disease. The daily drinking water amount should be the previous day's urine output plus 300-500ml, and specific instructions should be followed from the attending cardiologist. Monitor body weight at home. If the weight increases by 2 kilograms within 3 days, it indicates excessive water retention in the body, and immediate medical attention is required to adjust the treatment plan.
6. Hypertensive patients who have been taking diuretics for a long time
Diuretics can accelerate the loss of potassium. It is recommended to supplement potassium through consuming bananas, oranges, and dark green vegetables. If there is concurrent renal dysfunction, it is essential to consult a nephrologist before supplementing potassium to avoid high potassium levels damaging the heart.
Key points of scientific hydration after exercise
After exercise, don't immediately drink a large amount of water. Take a 10-minute break first, and then drink water in small sips after your heart rate has stabilized. Replenish according to the amount of weight loss: for every 0.5kg of weight loss, drink 500ml of warm water. Drinking ice water after exercise is a high-risk cardiovascular trigger, so it must be avoided.
"Three No's Principle" for Hypertension Patients Regarding Water Drinking
• Drink water only when you feel thirsty
Thirst is already a signal of severe dehydration, leading to increased blood viscosity and a higher risk of cardiovascular and cerebrovascular diseases. It is recommended to drink small amounts of water regularly;
• Don't drink ice water
Low temperature stimulates vasoconstriction, increases blood pressure, and induces vasospasm;
• Avoid drinking all at once
A large amount of water intake in a single instance rapidly increases blood volume, thereby exacerbating the dual burden on the heart and kidneys.
Expert Introduction
Zheng Yin, Chief Physician
Vice President, Professor
Master's supervisor, scholar studying in the United States
Outstanding Experts with Outstanding Contributions in Hainan Province
Medical expertise
Specialized in the prevention, diagnosis, treatment, rehabilitation, and health management of cardiovascular and cerebrovascular diseases as well as geriatric diseases. Conducts cardiac rehabilitation for patients with hypertension, coronary heart disease, arrhythmia, heart failure, metabolic syndrome, post-stent implantation, and post-bypass surgery, including guidance on medication, exercise, nutrition, and sleep disorders.