Short answer: The dehydration Cabo visitors experience usually comes from strong sun, heat, alcohol, sweating during activities, or vomiting and diarrhea. Early signs are thirst, dark yellow urine, peeing less, headache, tiredness and dizziness. Move to shade, rest and sip water or an oral rehydration solution. If you cannot keep fluids down, a doctor can assess whether IV fluids are needed. Call 911 for confusion, fainting, a very fast heartbeat, no urine for many hours, or a hot, dry body temperature with collapse.
Los Cabos is sunny and dry for much of the year, and summer and early fall bring intense heat and humidity. Add beach days, golf, hiking, boat trips, tequila tastings and long flights, and it is easy to lose more fluid than you take in. This guide explains how to recognize dehydration, what to do at home, when an IV drip may be appropriate and the red flags that need emergency care. It is general information, not a diagnosis. If you feel unwell, our doctors can see you at our walk-in clinic in Cabo San Lucas or at your hotel.
Signs of dehydration in Cabo
The Mayo Clinic lists these common signs of dehydration in adults:
- Strong thirst and a dry mouth
- Peeing less often, and dark yellow urine
- Tiredness, weakness or feeling sluggish
- Dizziness or light-headedness, especially when standing up
- Headache
- Confusion, in more severe cases
Young children may have a dry mouth and tongue, no tears when crying, fewer wet diapers, sunken eyes or unusual sleepiness or irritability. Older adults may not feel thirsty even when they are low on fluids, so it helps to remind them to drink. You can read more on the Mayo Clinic dehydration page.
Common causes on a Cabo trip
- Heat and sun: sweating at the beach, by the pool, on the golf course or on a boat.
- Alcohol: it makes you pee more and is easy to overdo in the heat.
- Stomach bugs: vomiting and diarrhea can drain fluids quickly. See our guide to food poisoning in Cabo.
- Travel: dry cabin air and not drinking on long flights.
- Exercise: hiking, surfing, running or fishing in the midday sun.
Dehydration Cabo: what to do at home
Mild dehydration can usually be managed by replacing fluids by mouth. These general steps help:
- Get out of the heat. Move to shade or an air-conditioned room and rest.
- Sip, do not gulp. Drink small, frequent amounts of water, especially if you feel queasy.
- Use an oral rehydration solution if you have been vomiting, have diarrhea or have sweated heavily. These are sold at pharmacies as electrolyte drinks or powder sachets and replace salts as well as water.
- Skip alcohol and limit caffeine until you feel better.
- Cool down with a cool shower or damp cloths if you feel overheated.
- Check your urine. Pale yellow urine is a good sign that you are catching up.
People with heart or kidney conditions, or who take medicines such as diuretics, should ask a doctor how much fluid is right for them.
Heat exhaustion versus heat stroke
Dehydration often comes with heat illness. Heat exhaustion causes heavy sweating, cool clammy skin, nausea, headache, cramps and weakness, and usually improves with rest, cooling and fluids. Heat stroke is an emergency: body temperature becomes very high, the person may stop sweating, become confused, slur their speech, have a seizure or collapse. Call 911 and start cooling them while you wait.
When IV fluids may help
Oral fluids are the first choice for most people. A doctor may recommend IV fluids when someone cannot keep liquids down because of vomiting, is moderately dehydrated, or is not improving with drinking. An IV is a medical treatment, so a clinician should first check your symptoms, vital signs, medical history and medicines to make sure it is appropriate and safe.
Our IV therapy in Cabo starts with that health screening and can be given at your hotel, villa or our clinic. For fluid and electrolyte replacement, the usual option is our hydration IV drip. If a hangover is part of the picture, you can also read about the hangover IV, and our article on whether IV therapy is safe on vacation explains who should avoid it.
An IV drip is not a replacement for emergency care. If you have any of the red flags below, the right place is a hospital emergency department.
Red flags: when dehydration is an emergency
| Sign | What it may mean | What to do |
|---|---|---|
| Confusion, slurred speech, seizure, fainting or collapse | Severe dehydration or heat stroke | Call 911; cool the person |
| Very fast heartbeat or breathing, chest pain | Severe fluid loss or another serious problem | Call 911 |
| No urine for 8 hours or more, or a baby with no wet diaper for several hours | Significant dehydration | Urgent medical care |
| Cannot keep any fluids down for several hours | Risk of worsening dehydration | See a doctor the same day |
| Bloody diarrhea, black stools or high fever | Possible serious infection or bleeding | Urgent medical care |
| Thirst, dark urine and mild headache that improve with drinking | Mild dehydration | Rest, fluids and observation |
Babies, young children, older adults, pregnant travelers and people with chronic conditions can get dehydrated faster, so be quicker to seek help for them. For serious situations, read our guide to a medical emergency in Cabo as a tourist and our emergency care in Cabo page.
How to prevent dehydration on your trip
- Carry water on excursions and drink before you feel very thirsty.
- Alternate alcoholic drinks with water.
- Plan outdoor activities for the morning or late afternoon.
- Wear a hat, light clothing and sunscreen; sunburn adds to fluid loss.
- Pack oral rehydration sachets, or have them brought by pharmacy delivery.
- Watch children and older relatives closely on hot days.
Feeling dizzy, drained or unable to keep fluids down? Message our team on WhatsApp at +52 624 409 5065. Tell us your symptoms and where you are staying, and we will help you decide whether you need a doctor visit, IV fluids or emergency care. In an emergency, call 911.
Frequently asked questions
How do I know if I am dehydrated in Cabo?
Common signs are thirst, dry mouth, dark yellow urine, peeing less, headache, tiredness and dizziness. Confusion or fainting are signs of severe dehydration.
Is water or an electrolyte drink better?
Water is fine for mild dehydration. If you have vomiting, diarrhea or heavy sweating, an oral rehydration solution also replaces lost salts.
Do I need an IV for dehydration?
Most people recover with oral fluids. A doctor may recommend IV fluids if you cannot keep liquids down or are moderately dehydrated, after a health screening.
Can I get an IV drip at my hotel in Cabo?
Yes, a clinician can assess you and, if appropriate, start a hydration IV at your hotel, villa or our clinic.
When is dehydration an emergency?
Call 911 for confusion, fainting, seizures, a very fast heartbeat, chest pain or signs of heat stroke such as a very high temperature and collapse.