October 4, 2026, 6:41 am | Read time: 6 minutes

For many young women, the bladder is not necessarily an organ they think much about. However, it is often worth doing so. For example, it can pay off in older age not to immediately respond to every slight urge to urinate, meaning to train the bladder a bit. It is also advisable to perform strengthening exercises for the pelvic floor to strengthen the muscle plate that supports the bladder. Pregnancy, childbirth, hormonal changes, and aging can alter bladder function. These changes can lead to symptoms such as urgency or nocturnal urination.

There are also triggers of nocturia that women can influence less easily. FITBOOK discussed the topic with gynecologist Dr. Christian Albring.

Possible Natural Reasons for Nocturnal Urination in Women

The term nocturia initially describes waking up at night to urinate. The symptom can have many different causes, some of which are harmless. Nocturnal urination can arise from everyday and temporary circumstances. These include, for example, high fluid intake in the evening, a lot of coffee or tea, and alcohol consumption.

During pregnancy, nocturia is very common and usually harmless. Hormonal changes can increase kidney activity and thus urine production. At the same time, more fluid is returned from the tissue to the circulation while lying down and excreted through the kidneys. Additionally, the growing uterus can increasingly press on the bladder, causing urgency even with less filling.

The presence of nocturia does not necessarily mean there are health problems. But it can.

As Dr. Albring explains to FITBOOK, several factors often come together in nocturia in women. We will address them individually.

Overactive Bladder and Infections

A neurologically overactive bladder can cause a strong urge to urinate even with slight filling, leading to more frequent emptying. Recurrent bladder infections can also irritate the bladder lining and change bladder function in the long term. As the doctor explains, such changes can lead to reduced bladder capacity and a so-called bladder storage disorder. The bladder can then store less urine before urgency arises again. Age-related changes and shrinkage of the bladder lining can also play a role.

When the Bladder Shrinks with Age

“As we age, the bladder lining shrinks,” explains the gynecologist. Interestingly, “this is especially true when little is drunk.” Normally, the bladder’s capacity is at least 300 to 400 milliliters. However, if women consume very little fluid, the bladder shrinks, and so does its capacity. “Once this reduced volume is reached, the woman must go to the bathroom.”

This is important information for women. Those affected by nocturia might be inclined to reduce their fluid intake, hoping not to have to get up as often at night. It remains important to drink two to three liters a day, warns Dr. Albring. But: not in the evening.

High Fluid Intake in the Evening (with Heart Problems)

“It is generally very important to drink enough throughout the day, about two to three liters of fluid daily,” says the doctor. However, larger amounts should not be consumed immediately before bedtime, as the fluid must be excreted through the kidneys, increasing nocturnal urination.

The distribution of fluid in the body plays a special role. During the day, some people, especially those with reduced heart function, accumulate more fluid in the tissue and legs. While lying down, this fluid is reabsorbed into the bloodstream and then excreted through the kidneys. This can lead to increased urine production, especially at night. People with heart failure who also drink large amounts in the evening can be particularly affected by nocturia.

Physical Changes Due to Pregnancy

In connection with possible causes of nocturia, Dr. Albring points to possible long-term consequences of vaginal birth. He reports on a study whose results show that “many women after a vaginal birth, sometimes many years later, suffer from bladder weakness up to prolapse of the uterus.”¹

He describes injuries to the pelvic floor during birth as a possible cause. In particular, the levator ani muscle, an important pelvic floor muscle, can be injured or torn. At the same time, the structures of the pelvic floor and vagina can be severely overstretched. This can change the position of the bladder and impair the function of the bladder outlet muscle.

Regarding nocturia, it is particularly relevant that such changes can affect the function and storage capacity of the bladder. A changed bladder function can lead to urgency occurring earlier and the bladder needing to be emptied more frequently. However, whether and to what extent such a pelvic floor injury actually contributes to nocturia cannot be deduced solely from the presence of bladder weakness.

Importance of Follow-Up Care

Dr. Albring therefore emphasizes the importance of a thorough examination of the pelvic floor after a vaginal birth. In his view, pelvic floor injuries are not always immediately recognized. A medical examination can therefore be useful to identify possible injuries or prolapses and, if necessary, discuss measures to stabilize and restore the pelvic floor.

More on the topic

Nocturnal Urge to Urinate What It Can Say About Your Health if You Need to Use the Bathroom Twice a Night

Many Women Affected When to Address an Overactive Bladder and What Can Help

Estrogen Deficiency in Menopause

Another possible cause of changes in bladder function that can promote nocturia in women is, according to gynecologist Albring, the estrogen deficiency that occurs with the onset of menopause. “In this phase of life, the ovaries produce less and less estrogen until the body’s own estrogen production finally decreases significantly.” The estrogen deficiency affects not only the reproductive organs but also the mucous membranes and tissue in the urinary tract and vagina.

The bladder lining and vaginal mucosa can become thinner and more sensitive, explains the expert. The elasticity and function of the tissue can also change. This can lead to symptoms such as (nocturnal) urgency, frequent urination, or an increased susceptibility to urinary tract infections.

What can women do about it? “In this case, estrogenization is very useful,” meaning a medical supply of the female sex hormone. However, such treatment must be individually assessed and coordinated with the treating doctors.

Other Internal Causes

In addition to changes in the bladder and pelvic floor, internal diseases can also lead to increased nocturnal urine production. As already described, this includes, for example, heart failure. But diabetes mellitus and other diseases can also be associated with increased nocturnal urine output.

Furthermore, certain medications can affect the frequency of nocturnal urination. These include, for example, some medications used to treat high blood pressure that promote the excretion of fluid through the kidneys. Depending on the active ingredient and time of intake, this can increase urine volume–even during the night.