Why is urine warm?
Urine is the way your body expels excess water, salts, and other compounds. The kidneys are responsible for regulating fluid and electrolyte balances in the body.
When they sense excess fluids and compounds, they release them. Until then, urine is stored in a person’s bladder. This makes urine the same temperature as the body itself.
Urine is typically the same as a person’s body temperature. On average, this is 98.6˚F (37˚C). Some people have normal temperature variations that may be slightly hotter or slightly cooler than this. Urine will usually maintain its temperature outside the body for about four minutes.
If you’ve ever had a urinalysis, you may have noticed that your urine feels hot in the sample cup. This is because your urine is the same temperature as your internal body. It’ll feel hot since your external body temperature is often cooler, due to the outside air.
When your urine is hotter than normal
Because urine is the same temperature as the body itself, there may be times when the urine is hotter than normal. This may happen when you have a fever or you’ve just finished a workout.
Typically, the body will take about an hour to return to its usual temperature post-workout.
A pregnant woman also may have urine that’s hotter than normal. This is because a woman’s body temperature naturally increases during pregnancy due to a faster-than-normal metabolism.
A difference exists between urine that’s hot from a temperature perspective and urine that feels as if it’s burning when you pee. This symptom is known as dysuria.
A burning sensation could indicate the presence of a urinary tract infection (UTI). Other symptoms associated with a UTI include:
- passing only small amounts of urine, yet feeling like you need to urinate more
- cloudy-looking urine
- urine that smells strongly, foul, or both
- blood-tinged urine
- increased frequency of urination
A burning sensation when you pee can also be a sign of a sexually transmitted infection (STI), such as chlamydia or gonorrhea. Regardless of the cause, you shouldn’t ignore the signs of dysuria. See your doctor if it persists beyond one to two bathroom trips.
If your urine does feel hot as you pass it, you can take your body temperature with a thermometer. If your body temperature has increased — perhaps due to illness — your urine may feel warmer, too.
While you can normally control a fever with over-the-counter fever reducers, always see your doctor for body temperatures greater than 103˚F (39˚C) in adults. Doctors consider this a high-grade fever.
Also, if a fever of 101˚F (38˚C) or higher lasts more than 10 to 14 days, see your doctor.
Hot urine is usually a reflection of your body’s core temperature. If you’re hot because of fever, exercise, or in a warmer climate, chances are that your urine will be hot as well.
If urination is accompanied by a burning sensation or other signs of a UTI, see your doctor.