24/7 Emergency Care. Our patients are first.
If you cannot keep fluids down, you are barely urinating, you feel faint, or you seem confused or unusually weak, do not wait it out. Severe dehydration needs medical treatment right away.
Go to the ER right away if dehydration comes with:
These are warning signs of more serious dehydration, not just ordinary thirst.
Children and older adults should not “wait and see” with dehydration.
Bring a child in promptly for no wet diaper for 3 hours, no tears when crying, sunken eyes, unusual sleepiness, or inability to keep fluids down. Older adults deserve faster evaluation because they may become dehydrated with less obvious thirst and may show confusion or marked weakness instead.
What dehydration actually means
Dehydration happens when the body loses more fluid than it takes in. Once that happens, the body no longer has enough water and electrolytes to function normally. Mild dehydration can often improve with oral fluids, but severe dehydration is different and may need emergency treatment.
Common causes of dehydration
The most common causes are vomiting, diarrhea, fever, heavy sweating, heat exposure, and simply not drinking enough. It can also happen when someone urinates too much, including with uncontrolled diabetes or some medications such as diuretics.
Not every case needs the ER
This part matters. If you are mildly dehydrated, still alert, and able to drink and keep fluids down, home rehydration may be enough. The ER becomes the right choice when symptoms are worsening, oral fluids are not staying down, urine output drops sharply, or the person looks sick, weak, confused, or unstable.
When dehydration becomes dangerous
Severe dehydration can affect circulation, kidney function, mental status, and overall body function. Signs such as confusion, rapid heartbeat, rapid breathing, very dark or absent urine, listlessness, shock, or loss of consciousness should be treated as emergencies.
Who is at higher risk
Infants, young children, older adults, and people with illnesses that cause vomiting, diarrhea, or fever are at higher risk. People with diabetes, kidney disease, or medicines that increase urination can also dehydrate more easily.
What Post Oak ER can do for dehydration
At Post Oak ER, dehydration can be evaluated with an emergency exam, vital-sign monitoring, and on-site lab testing. If needed, treatment may include IV fluids and medications for related symptoms such as nausea or vomiting. When dehydration is tied to abdominal pain, infection, injury, or another concerning cause, Post Oak ER also has on-site CT, X-ray, ultrasound, trauma care, and cardiac-focused emergency services available 24/7.
What severe dehydration treatment may involve
Severe dehydration should be treated right away, and IV fluids are often used because they are absorbed quickly and help restore fluid and electrolyte balance faster than trying to recover by mouth alone.
prevention advice
Prevention is straightforward: drink enough fluids, be more careful during hot weather, replace fluids lost from vomiting or diarrhea, and pay extra attention to children and older adults, who can worsen faster than expected. But once severe symptoms appear, prevention advice is no longer the issue — emergency treatment is.
A simple rule to remember
If you are thirsty and dry, that may still be manageable. If you are weak, dizzy, confused, barely urinating, or cannot keep fluids down, that is no longer “just dehydration.” That is when you should get checked.
Whether you’re in Westchase, Midtown, or the Heights, getting to Post Oak ER is simple. We’re centrally located near major Houston routes like I‑610 and San Felipe — just a short drive from Memorial Park and River Oaks. Many patients reach us via Westheimer or Woodway Dr., depending on their neighborhood.
We accept most major insurance plans and also welcome self-pay patients with transparent, upfront pricing. Many Memorial-area patients visit us using Blue Cross, Aetna, Cigna, Humana, Molina, and United Healthcare.
Yes. We’re open 24 hours a day, 7 days a week. Our freestanding ER model is designed to minimize or eliminate wait times so you’re seen fast.
No. Walk in anytime. If it’s an emergency, come straight in or call ahead and we’ll be ready: 832-581-2277.
5018 San Felipe St, Houston, TX 77056 — near The Galleria/Uptown. Free, convenient parking right by the entrance.
Yes. Our board-certified emergency physicians care for all ages, including pediatric emergencies.
Chest pain, shortness of breath, severe headache/migraine, abdominal pain, injuries and fractures, cuts requiring stitches, high fever, dehydration, allergic reactions, asthma attacks, and more. If you believe it’s life-threatening, call 911.
Yes. We offer on-site CT scans, digital X-rays, and a full laboratory, so most tests and results are done during your visit.
Absolutely. We routinely see patients from Uptown, The Galleria, River Oaks, Tanglewood, and Memorial.
A photo ID, insurance card (if available), a list of medications/allergies, and any recent medical records you have.
We accept most major private insurance plans. Coverage varies by plan; our team will help verify benefits and discuss any out-of-pocket costs. Questions? Call 832-581-2277.
Urgent care handles minor illnesses/injuries. ERs have advanced imaging, lab, medications, and emergency physicians for time-sensitive or severe conditions (e.g., chest pain, severe abdominal pain, serious injury, difficulty breathing).
Yes. If inpatient care or surgery is required, we coordinate a direct transfer to the appropriate hospital.
Times vary by condition and testing, but our no-wait intake and on-site diagnostics help you get answers and treatment as quickly as possible.