A fever is a temporary increase in your body temperature, often due to an illness. Having a fever is a sign that something out of the ordinary is going on in your body. For an adult, a fever may be uncomfortable, but usually isn't a cause for concern unless it reaches 103 F (39.4 C) or higher. A part of your brain called the hypothalamus controls your body temperature. In response to an infection, illness, or some other cause, the hypothalamus may reset the body to a higher temperature. So when a fever comes on, it’s a sign that something is going on in your body.
The most common causes:
Children between the ages of 6 months and 5 years may experience fever-induced convulsions (febrile seizures), which usually involve loss of consciousness and shaking of limbs on both sides of the body.
If a seizure occurs:
Most seizures stop on their own. Take your child to the doctor as soon as possible after the seizure to determine the cause of the fever.
Although a fever is easy to measure with a thermometer, finding its cause can be hard. Besides a physical exam, your doctor will ask about symptoms and conditions, medications, and if you've recently traveled to areas with infections or have other infection risks.
Your doctor may ask if you have been around someone with COVID-19 or have any other symptoms of COVID-19.
Sometimes, you may have a "fever of unknown origin." In such cases, the cause could be an unusual or not obvious condition such as a chronic infection, a connective tissue disorder, cancer, or another problem.
A person who needs this remedy during flu feels chilly and exhausted, along with an anxious restlessness. The person may be thirsty, but often only takes small sips. If the digestive system is involved, nausea with burning pain, or vomiting and acrid diarrhea may occur. If the flu is respiratory, a watery, runny nose with sneezing paroxysms and a dry or wheezing cough are often seen. The person's head usually feels hot, while the rest of the body is chilly.
This remedy relieves high fever of sudden onset with profuse sweating, and hypersensitivity to light and noise.
This relieves high fever with body aches improved by staying immobile.
This remedy relieves bone pains and body aches associated with flu and severe colds. Increased thirst .
This relieves low-grade fever with weakness and tendency to nosebleeds and earaches.
This remedy relieves flu-like symptoms with fever, headache, dizziness and general weakness. Thirst less.
When this remedy is indicated in influenza, the person may have have high fever, violent chills, strong nausea and cramping in the digestive tract (or a painful cough and constricted breathing if the flu is respiratory). Headache usually occurs, along with oversensitivity to sound, bright light, and odors. A person who needs Nux vomica is often very irritable, feeling worse from exertion and worse from being cold in any way.
This remedy relieves fever with restlessness: The patient is continuously moving to find a comfortable position and relieve the body aches.
This remedy relieves high fever of sudden onset, with a hot face and dry skin. Anxious .
This remedy may be helpful if a person has dry fever that alternates with sweating, facial flushing, and a very sore throat with swollen tonsils. Pain may extend to the ears, and the eyelids may be swollen. Exposure to cool air and cold applications may bring relief. Despite the fever, thirst usually is low. The person can be very irritable, disliking interference.
When this remedy is needed during flu, the person has a fever with an easily-flushing face, and feels very weak and dizzy. Headache, hoarseness, sore throat, and cough are likely. If the focus is digestive, stomach pain and nausea or vomiting usually occur. A person who needs this remedy often has a strong anxiety, wanting others to be around to offer company and reassurance. Strong thirst, with a tendency to vomit when liquids warm up in the stomach, is a strong indication for Phosphorus.
This remedy may be useful if a flu is very long-lasting or has some lingering symptoms—often after people have neglected to take good care of themselves. Symptoms, either digestive or respiratory, will often have a hot or burning quality. The person may feel hot and sweaty, with low fever and reddish mucous membranes. Heat aggravates the symptoms, and the person often feels worse after bathing.