1. Shared Showers
Personal preferences matter. Someone may be comfortable urinating in their own shower but uncomfortable with another person doing the same in a shared bathroom.
If several people use the shower, respecting household hygiene preferences is reasonable.
2. Odor
Certain foods, medications, dehydration, and other factors can make urine smell stronger.
Because shower water usually dilutes urine quickly, odor generally does not remain for long, but thoroughly rinsing the area helps keep the shower fresh.
3. Keep the Shower Clean
Urinating in the shower does not replace normal bathroom cleaning.
Soap residue, body oils, dirt, mold, and microorganisms can accumulate on shower surfaces regardless of whether someone urinates there.
Regular cleaning is still necessary.
Conclusion
For a healthy person using their own shower, occasionally urinating while showering is generally unlikely to be a major hygiene concern, provided the area is rinsed normally.
The strongest practical argument for the habit is that it may save a little water by avoiding an additional toilet flush.
However, claims that urine disinfects wounds, treats fungal infections, or works like commercial urea-based skin-care products should not be taken as established medical advice.
Ultimately, whether you pee in the shower is largely a matter of personal preference, hygiene habits, and consideration for anyone else who shares the bathroom.