Hydration matters, but “more” is not always better.

Steady hydration is more useful than extremes

Dehydration can make urine more concentrated, while very large fluid loads can increase urgency and frequency. If you have been advised by a clinician to restrict fluids because of heart, kidney or another condition, that medical advice takes priority over general information.

Caffeine, alcohol and acidic or spicy foods

Some people notice more bladder irritation after caffeine, alcohol or certain acidic or spicy foods. Public clinical guidance sometimes suggests reducing potential bladder irritants as part of symptom management. That is different from claiming these foods cause prostatitis.

Use timing, not rigid targets

If night-time urination is a problem, discuss evening fluid timing with a clinician. Do not deliberately dehydrate yourself. A practical approach is to spread fluids through the day and observe whether very large drinks at once worsen urgency.

A short diary can reveal patterns

For three to five days, note approximate drinks, caffeine or alcohol, urinary frequency, urgency, pain and night-time waking. Bring the pattern to an appointment. A diary is a communication tool, not a diagnostic test.