---
title: "Hydration"
license: CC-BY-4.0
license_url: https://creativecommons.org/licenses/by/4.0/
source: https://medlineplus.gov/dehydration.html
source_license: "public domain (US government work)"
attribution: "Summary by iinventedlight (AI-assisted). Source: MedlinePlus / NLM, \"Dehydration (health topic)\" (public domain (US government work))."
condensed_by: "iinventedlight (Grok Bot, AI-assisted)"
fact_checked: 2026-10-14
date: 2026-10-14
status: reviewed
reviewed_on: 2026-10-14
category: health
checked_on: 2026-10-14
sources:
  - id: S1
    title: "Dehydration (health topic)"
    publisher: MedlinePlus / NLM
    url: https://medlineplus.gov/dehydration.html
    accessed: 2026-10-14
    license: "public domain (US government work)"
  - id: S2
    title: "About Water and Healthier Drinks (2026-03-05)"
    publisher: CDC
    url: https://www.cdc.gov/healthy-weight-growth/water-healthy-drinks/index.html
    accessed: 2026-10-14
    license: "public domain (US government work)"
---
# Hydration

## Summary
Fluid needs vary by age, sex, activity, pregnancy, and breastfeeding, so there is no single daily number; water and other drinks plus water-rich foods count. Drink more in heat, exercise, fever, or vomiting/diarrhea. Thirst, dry mouth, dark urine, and dizziness signal dehydration; confusion or fainting needs urgent care.

> **General information, not medical advice. See a clinician about your own situation; in an emergency call 911 (US).**

## Facts
- id: F1
  claim: Dehydration means losing more fluid than you take in; causes include diarrhea, vomiting, heavy sweating, and frequent urination.
  confidence: high
  date: 2026-10-14
  sources: [S1, S2]
  license: CC BY 4.0
- id: F2
  claim: Adult signs include strong thirst, dry mouth, less urination and sweating, dark urine, dry skin, tiredness, and dizziness.
  confidence: medium
  date: 2026-10-14
  sources: [S1]
  license: CC BY 4.0
- id: F3
  claim: Water helps keep normal body temperature, cushion joints, protect the spinal cord, and remove waste.
  confidence: medium
  date: 2026-10-14
  sources: [S2]
  license: CC BY 4.0
- id: F4
  claim: Daily water needs vary by age, sex, pregnancy, activity, and breastfeeding; ask a provider for a personal amount.
  confidence: high
  date: 2026-10-14
  sources: [S1, S2]
  license: CC BY 4.0
- id: F5
  claim: Most intake comes from water and other drinks; water-rich foods like many fruits and vegetables also count.
  confidence: medium
  date: 2026-10-14
  sources: [S2]
  license: CC BY 4.0
- id: F6
  claim: You need more fluid in hot weather, with more activity, with fever, and with diarrhea or vomiting.
  confidence: high
  date: 2026-10-14
  sources: [S1, S2]
  license: CC BY 4.0
- id: F7
  claim: Higher-risk groups include older adults (thirst can fade with age), infants and young children, some people with chronic illness, and people active outdoors in heat.
  confidence: medium
  date: 2026-10-14
  sources: [S1]
  license: CC BY 4.0
- id: F8
  claim: Mild cases: drink water (sports drinks if electrolytes were lost; watch the sugar); severe cases may need IV fluids.
  confidence: medium
  date: 2026-10-14
  sources: [S1]
  license: CC BY 4.0
- id: F9
  claim: Get medical help right away for confusion, fainting, no urination, or rapid heartbeat or breathing.
  confidence: medium
  date: 2026-10-14
  sources: [S1]
  license: CC BY 4.0

## Pointers
- answers: Full official guidance beyond this summary
  where: https://medlineplus.gov/dehydration.html; https://www.cdc.gov/healthy-weight-growth/water-healthy-drinks/index.html
  access: open, no account