High blood pressure affects more than 25 per cent of adults in the UK, according to the NHS.
But, you could be at risk of the condition, which is also known as hypertension, if you often pass urine at night, a nutritionist has revealed.
It could be caused by the kidneys having to work harder to regulate the amount of sodium in patients’ bodies, she said.
Almost 70 per cent of all men and women with high blood pressure said they had nocturia - the scientific name for waking up at night to use the loo.
“Nocturia is often overlooked as a symptom of high blood pressure, yet studies show that people with nocturia are more likely to have high blood pressure than those who don’t experience passing water at night,” said Brewer, on her website MyLowerBloodPressure.com.
“The relationship between uncontrolled hypertension and nocturia is partly due to the way urine output is regulated, and partly an attempt by your body to filter excess fluid and sodium from the circulation to bring your blood pressure down.
“When you have uncontrolled high blood pressure, your kidneys have to work harder to excrete the same amount of sodium as people with normal blood pressure.
“This leads to a tendency to retain both salt and fluid.
“This retained fluid may stay within the circulation, causing blood pressure to increase even further.”
Speak to a doctor if you frequently wake up in the night to pass urine, she added.
Starting treatment could help to resolve the problem.
But, nocturia could also be a sign of other conditions, including diabetes, an enlarged prostate gland, obstructive sleep apnoea, or even congestive heart failure.
High blood pressure often has no symptoms, and the only way to check your blood pressure is to have it checked, said the NHS.
If blood pressure is extremely high, there may be some warning signs to look out for.
Severe headaches, chest pain, or finding blood in urine could all be symptoms of hypertension.
All adults over 40 years old should check their blood pressure at least every five years.
Blood pressure can be checked at a local GP surgery, or at some pharmacists.
Having high blood pressure puts extra strain on blood vessels and vital organs.
It increases the risk of some deadly complications, including heart disease, heart attacks and strokes.