underhydrated
Lacking sufficient moisture
Underhydrated means not having consumed enough water or fluids.
The term appears in medical and fitness contexts to describe mild dehydration: Athletes who feel sluggish may simply be underhydrated.
It suggests a correctable state rather than a medical emergency—you're running low, not dangerously depleted.
Need for fluid
- dizzinessUnsteady, spinning sensation
- lightheadednessSensation of near-fainting
- fatigueWeariness from prolonged exertion
- headacheCranial pain
cramps · weakness · nausea · confusion · constipation · lethargy · drowsiness · sluggishness
Extremely dry or thirsty
Moisture from skin pores
- crampsInvoluntary muscle tightening
- overheatingBecoming dangerously warm
- enduranceSustained effort capacity
- marathonLong-distance footrace
workout · training · recovery · exertion · athletics · cycling · running
Conducting ions in solution
- heatstrokeBody's cooling system failure
- hypotensionAbnormally reduced arterial pressure
- tachycardiaExcessively fast pulse
- hospitalizationFormal entry into medical care
sodium · potassium · urinalysis · diuretics · renal
thirst
Need for fluid
- dizzinessUnsteady, spinning sensation
- lightheadednessSensation of near-fainting
- fatigueWeariness from prolonged exertion
headache · cramps · weakness · nausea · confusion · constipation · lethargy · drowsiness · sluggishness · irritability
parched
Extremely dry or thirsty
sweat
Moisture from skin pores
- crampsInvoluntary muscle tightening
- overheatingBecoming dangerously warm
- enduranceSustained effort capacity
marathon · workout · training · recovery · exertion · athletics · cycling · running
electrolytes
Conducting ions in solution
- heatstrokeBody's cooling system failure
- hypotensionAbnormally reduced arterial pressure
- tachycardiaExcessively fast pulse
hospitalization · sodium · potassium · urinalysis · diuretics · renal
sweating
Moisture through pores
- diarrheaFrequent liquid bowel movements
- vomitingExpelling stomach contents orally
- alcoholIntoxicating hydroxyl compound
caffeine · diuretics · fever · high-altitude · neglect · aging · medication · diabetes · exercise · travel
underhydratedoverhydrated
Excess fluid consumed
hyperhydrated · hydrated · water-logged · saturated · waterlogged