Daijiworld Media Network - Bengaluru

Bengaluru, Aug 23: A stressful day can leave the heart racing and the mind restless, but when stress becomes a constant part of life, its effects can extend beyond mood and sleep. Prolonged stress can contribute to repeated rises in blood pressure and changes in everyday habits, potentially placing an additional burden on the kidneys over time.

The relationship between stress, blood pressure and kidney health is not as simple as saying that stress directly causes kidney disease. Instead, chronic stress can contribute to repeated increases in blood pressure and unhealthy lifestyle habits, while uncontrolled high blood pressure can gradually damage the kidneys.

The body's stress response is designed to deal with short-term danger. When a person experiences stress, the body releases stress hormones that can increase heart rate and blood pressure while narrowing blood vessels. This response can be useful when the body needs to respond quickly to an immediate threat. However, when the body repeatedly remains in this state of heightened alertness, the effects can become less beneficial.

The US National Center for Complementary and Integrative Health has noted that long-term stress can contribute to several health problems, while relaxation responses can help lower blood pressure. Research has also suggested an association between chronic psychological stress and hypertension, although stress is only one factor among several that influence blood pressure.

A systematic review published in PubMed found that chronic stress was more consistently associated with sustained increases in blood pressure than short-lived stressful events. This highlights the importance of recognising prolonged stress as a potential contributor to cardiovascular and overall health risks.

The kidneys play a crucial role in maintaining the body's internal balance. They filter waste and excess fluid from the blood and help regulate fluid levels and blood pressure. When blood pressure remains elevated for years, it can damage the small blood vessels and filtering structures within the kidneys.

Over time, this damage can reduce the kidneys' ability to function properly and may contribute to chronic kidney disease. High blood pressure is one of the leading risk factors for kidney damage, particularly when it remains uncontrolled for a prolonged period.

The relationship also works in the opposite direction. Once the kidneys become damaged, they may have difficulty removing enough salt and excess fluid from the body. This can cause blood pressure to rise further. The increased pressure can then place additional strain on the kidneys, creating a harmful cycle in which kidney damage and high blood pressure can worsen each other.

The US National Institute of Diabetes and Digestive and Kidney Diseases describes this close relationship between high blood pressure and kidney disease and stresses the importance of controlling blood pressure to protect kidney function.

“Chronic stress should not be looked at only as an emotional or mental health issue. When stress continues for a long period, the body remains in a state of heightened alertness, which can contribute to repeated increases in heart rate and blood pressure. If blood pressure stays high over time, it can damage the small blood vessels and filtering structures in the kidneys,” said Dr Srivatsa A, Consultant Nephrologist and Transplant Physician, Apollo Hospitals, Bengaluru.

“There is also a vicious cycle because once the kidneys are damaged, they can have difficulty regulating fluid balance and blood pressure, which may cause blood pressure to rise further,” he added.

According to Dr Srivatsa, stress can also affect several everyday behaviours that are important for maintaining good health. People experiencing prolonged stress may have disturbed sleep, changes in eating habits, reduced physical activity or difficulty following prescribed medicines regularly. These changes can indirectly contribute to poor blood pressure control and increase health risks.

Managing stress is therefore an important part of maintaining overall cardiovascular and kidney health. Adequate sleep, regular physical activity, a balanced diet, relaxation practices and maintaining social and emotional support can help people cope with prolonged stress. For people who have been prescribed medicines for blood pressure or other conditions, taking them regularly as advised is also important.

Keeping blood pressure under control is particularly important for protecting the kidneys. Regular monitoring can help identify persistently elevated blood pressure before it causes significant damage. People with high blood pressure, diabetes, a family history of kidney disease or other risk factors may also benefit from periodic kidney-function evaluation as advised by their healthcare provider.

The key message is that occasional stress is a normal part of life and does not automatically mean that a person will develop kidney disease. The greater concern is prolonged, poorly managed stress combined with persistent high blood pressure and unhealthy lifestyle factors. Addressing these factors early can help reduce the long-term strain on the heart, blood vessels and kidneys.