what temperature should you go to the hospital

You should go to the hospital for a fever if the temperature is very high, the person is very young or vulnerable, or there are worrying symptoms along with the fever.

Key temperature numbers

• Adults and older children: A temperature around 103–104°F (39.4–40°C) or higher, especially if it does not come down with fever medicine or is accompanied by other serious symptoms, should be treated as an emergency and checked in person.

• Very high fever: A temperature around 105°F (40.5°C) or higher is generally considered dangerous and needs immediate emergency care.

• Babies under 3 months: Any rectal temperature of 100.4°F (38°C) or higher is an emergency and the baby should be seen urgently, often at the ER if a pediatrician cannot see them immediately.

• Children 3 months to about 3 years: A fever of 102–102.2°F (38.9°C) or higher that lasts, or comes with worrying symptoms (trouble breathing, rash, vomiting, very sleepy, not drinking), needs urgent medical evaluation.

Fever is only one part of the picture; how the person looks and acts matters just as much as the number.

Dangerous warning signs (go to ER now)

Go to the emergency department or call emergency services right away if a fever (any temperature) is present with:

• Difficulty breathing, chest pain, or very fast breathing.

• Confusion, trouble waking up, acting very “out of it,” or a stiff neck.

• Seizure, fainting, or severe headache.

• A purple or unusual rash, or rash that spreads quickly.

• Persistent vomiting, not keeping fluids down, or no urination for many hours.

• Fever lasting more than about 3 days in adults or not improving at all with medication.

For newborns under 1 month, a fever of 100.4°F (38°C) or higher is automatically an emergency, even if they do not look very sick.

Typical “call a doctor” situations

You should contact a doctor or urgent care (same day) if:

• An adult has a fever around 101–103°F (38.3–39.4°C) that lasts more than a couple of days, or feels very unwell, even if the number is not extremely high.

• An older adult, pregnant person, or someone with a weak immune system (cancer, steroids, transplant, HIV, etc.) has a temperature of about 100.4–101°F (38–38.3°C) or higher.

• A child over 3 months has a fever plus ear pain, bad sore throat, painful urination, or worsening cough.

In these cases, a clinician can decide if home care, urgent care, or the ER is safest.

Quick HTML table of key thresholds

html

<table>
  <thead>
    <tr>
      <th>Age / Situation</th>
      <th>Temperature</th>
      <th>Recommended action</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Newborn &lt; 1 month</td>
      <td>≥ 100.4°F (38°C)</td>
      <td>Go to emergency department immediately.[web:3][web:5]</td>
    </tr>
    <tr>
      <td>Infant 1–3 months</td>
      <td>≥ 100.4°F (38°C)</td>
      <td>Urgent same‑day evaluation; ER if pediatrician not available.[web:3][web:5]</td>
    </tr>
    <tr>
      <td>Child 3–36 months</td>
      <td>≥ 102–102.2°F (≈38.9°C)</td>
      <td>Call doctor; ER if very ill‑appearing or with red‑flag symptoms.[web:3][web:5]</td>
    </tr>
    <tr>
      <td>Older child</td>
      <td>≥ 103°F (39.4°C)</td>
      <td>Urgent care/ER, especially with breathing issues, confusion, or severe pain.[web:3][web:7]</td>
    </tr>
    <tr>
      <td>Adult</td>
      <td>≥ 103–104°F (39.4–40°C)</td>
      <td>Seek urgent in‑person medical care; consider ER if very unwell.[web:1][web:3]</td>
    </tr>
    <tr>
      <td>Any age</td>
      <td>≈ 105°F (40.5°C) or higher</td>
      <td>Go to ER immediately; this is a medical emergency.[web:1][web:3][web:5]</td>
    </tr>
  </tbody>
</table>

Forum and “trending” angle

Online parenting and health forums often show worried posts about fevers just over 100°F in babies and toddlers, with many users urging ER visits much earlier than official guidelines, especially for very young infants. Many experienced parents and nurses in those discussions emphasize watching overall behavior (alertness, feeding, breathing) and not just the thermometer, but they still agree that very young babies and any child with a fever plus serious symptoms should be seen without delay.

If you or someone with you currently has a high fever or any of the red‑flag symptoms above, seek in‑person medical care or emergency help right now, rather than waiting for online advice.