A temperature taken using a mouth thermometer (oral temperature) that's 100 F (37.8 C) or higher is generally considered to be a fever. Depending on what's causing a fever, other fever …

Jul 17, 2024 · Dengue (DENG-gey) fever is a mosquito-borne illness that occurs in tropical and subtropical areas of the world. Mild dengue fever causes a high fever and flu-like symptoms.

Dec 2, 2023 · Rheumatic fever is an inflammatory disease that can develop when strep throat or scarlet fever isn't properly treated. Strep throat and scarlet fever are caused by an infection …

Jun 25, 2024 · For a baby who's less than 3 months old and has a fever, get medical help right away. Also, seek emergency medical care for a child who has any of these symptoms after …

May 7, 2022 · When a fever lasts for more than three weeks — constantly or on several occasions — and there is no clear cause, it's usually called a fever of unknown origin.

Early symptoms may include: Lasting fever that starts low and rises during the day. Fever can go as high as 104 degrees Fahrenheit (40 degrees Celsius). Stomach pain. Chills. Headache. …

Apr 30, 2025 · Overview Scarlet fever is a bacterial illness that develops in some people who have strep throat. Also known as scarlatina, scarlet fever features a bright red rash that covers …

Feb 4, 2025 · Fever treatment: Quick guide to treating a fever By Mayo Clinic Staff A fever is a common sign of illness. But that doesn't always mean it's a bad thing. In fact, fevers may help …

Sep 5, 2023 · A fever – when the body's temperature is above 100.4 degrees Fahrenheit – is typically a sign that your body is fighting off an infection. Dr. Tina Ardon, a Mayo Clinic family …

The fungi can cause valley fever, also known as acute coccidioidomycosis (kok-sid-e-oi-doh-my-KOH-sis). Valley fever may be mild and get better without treatment.