Increased Urination: Is It Normal After Hydration?

Experiencing a quick urge to urinate after drinking water, along with a total urine output that exceeds the amount of water consumed, can indicate a condition known as polyuria. This may be associated with various factors, including diabetes mellitus, excessive fluid intake, or certain medications. It is advisable to consult a healthcare professional for further evaluation and diagnosis?

Hello Doctor, two years ago I experienced a sudden urinary tract infection with pain and hematuria, and I went to the hospital for treatment and examination.
After taking medication for a week, I returned for a follow-up check and was informed that there was dilation in my kidneys.
Subsequently, I underwent an X-ray, blood tests, and several urine and kidney ultrasound examinations, but the doctor said there were no changes and advised me to follow up every six months.
Since the treatment for the urinary tract infection, I have experienced dull and uncomfortable pain in the area of my lower back where the kidney ultrasound was performed, along with a strange aching sensation that feels like something is tugging inside.
There have been a couple of instances of sudden aching, but they resolved quickly.
I have been taking the contraceptive pill YASMIN, and recently I noticed that I feel the urge to urinate shortly after drinking water.
Additionally, I found that after taking just a sip of water before showering, I had to go to the bathroom several times after showering, with a significant amount of urine each time.
I have stopped taking the contraceptive pill since then.
I have checked my blood sugar and blood pressure several times, and they are normal.
I also kept a urinary diary for about two weeks and found that my total urine output was indeed greater than my total fluid intake.
The daily difference varies, with at least a 100 ml difference recorded once, and up to nearly 1000 ml on another occasion, with most differences around 500 ml (and my daily fluid intake is about 1000 ml).
Since my next follow-up appointment is still two months away, I have many questions and am unsure if I should schedule an earlier appointment.
I would like to ask: (1) Is it concerning that my daily urine output exceeds my fluid intake? Should I schedule an earlier appointment to discuss this with my doctor? (2) Is it normal to feel the urge to urinate shortly after drinking water (about 50-100 ml at a time)? I also noticed that my bladder feels the urge to urinate as soon as it exceeds 100 ml.
(3) Are imaging studies with contrast agents and water deprivation tests harmful to the kidneys? Thank you!

Win, 30~39 year old female. Ask Date: 2017/05/04

Dr. Wang Weijie reply Internal Medicine

Hello,
1.
Fluid intake includes both the water content in food and the amount of water consumed.
Relying solely on water intake can lead to inaccuracies; it is advisable to check the specific gravity of urine and the presence of proteinuria to assess hydration status.

2.
What is the residual urine volume? The bladder pressure, along with the contraction of the detrusor muscle and the resistance of the urethra during urination, should be evaluated to determine if there are any urinary function disorders, urethral outlet obstructions, or issues with urethral patency.

3.
Each individual's condition is different, so it is recommended to consult a physician to check for normal kidney function before proceeding with further evaluation.

Wishing you safety and health,
Dr.
Wang Wei-Jie, Attending Physician, Nephrology Department, Taoyuan General Hospital, Ministry of Health and Welfare.

Reply Date: 2017/05/04

More Info

Increased urination, especially after hydration, can be a common experience, but it can also indicate underlying health issues that warrant further investigation. Based on your description, it seems that you have been experiencing a notable increase in urination, particularly after drinking water, which raises several important questions regarding your urinary health and kidney function.

1. Daily Urine Output Exceeding Fluid Intake: The fact that your total urine output is consistently greater than your fluid intake could be indicative of a condition known as polyuria. Polyuria can result from various factors, including diabetes mellitus, diabetes insipidus, or even certain medications. In your case, since you have a history of urinary tract infections (UTIs) and kidney dilation, it is crucial to monitor this symptom closely. If your urine output continues to exceed your fluid intake significantly, it would be wise to consult your healthcare provider sooner rather than later. This could help rule out any serious conditions affecting your kidneys or urinary system.

2. Rapid Urge to Urinate After Drinking Water: Experiencing a quick urge to urinate after consuming small amounts of water can be normal for some individuals, especially if the bladder is sensitive or if there is an underlying condition affecting bladder function. However, if this sensation is accompanied by discomfort, pain, or changes in urine color or odor, it may indicate an issue that needs to be addressed. The bladder typically signals the need to void when it reaches a certain volume, and if you are feeling the urge after consuming only 50-100 ml of water, it may suggest that your bladder's capacity or sensitivity is altered.

3. Safety of Imaging Tests and Water Deprivation: Regarding the safety of imaging tests such as contrast-enhanced imaging and water deprivation tests, these procedures are generally safe when performed under medical supervision. However, they can pose risks, particularly to individuals with pre-existing kidney conditions. Contrast agents can sometimes lead to contrast-induced nephropathy, especially in patients with compromised renal function. Therefore, it is essential to discuss your concerns with your healthcare provider before undergoing such tests. They can evaluate your kidney function and determine the appropriateness of these tests based on your current health status.

In summary, while increased urination can be a benign symptom, your specific circumstances—such as your history of UTIs, kidney dilation, and the significant difference between fluid intake and urine output—suggest that it would be prudent to seek medical advice sooner rather than later. Keeping a detailed record of your symptoms, fluid intake, and urine output can provide valuable information for your healthcare provider. Additionally, if you experience any new symptoms such as pain, fever, or changes in your urine, do not hesitate to seek immediate medical attention. Your health is paramount, and proactive management is key to addressing any potential issues early on.

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