What causes high fever and headache?

Generally, a high fever refers to hyperthermia. Headache associated with high fever may be related to factors such as thermoregulatory imbalance, dehydration, influenza, otitis media, meningitis, and others. It is recommended to seek medical attention promptly and receive treatments such as general supportive care or medication under the guidance of a physician. Specific analyses are as follows:

1. Thermoregulatory Imbalance

Body temperature may temporarily rise following intense physical activity, exposure to high ambient temperatures, or emotional excitement, which may be accompanied by headache. Lowering the environmental temperature and appropriately replenishing fluids and electrolytes can help.

2. Dehydration

Dehydration increases blood viscosity and reduces blood flow, potentially leading to hypotension and impaired circulation, thereby affecting the body's heat dissipation mechanisms and causing hyperthermia. It may also reduce oxygen supply to the brain, triggering headaches. Timely fluid replacement is essential; intravenous infusion such as normal saline may be necessary in severe cases.

3. Influenza

Smoking, underlying illness, or fatigue may lead to decreased immunity, increasing susceptibility to influenza. Following influenza virus infection, the body mounts an inflammatory response and releases inflammatory mediators, resulting in high fever and increased sensitivity of cerebral blood vessels, which can cause headache. Symptoms often include cough, sore throat, and muscle aches. Medications such as oseltamivir phosphate capsules, abidol hydrochloride tablets, or Lianhua Qingwen granules may be used as directed by a physician.

4. Otitis Media

Bacterial or viral infections can easily lead to otitis media. The body releases inflammatory mediators that elevate body temperature. Inflammation may also stimulate nerve endings in the middle ear, causing headache. Symptoms may include ear pain, ear discharge, and hearing loss. Treatment under medical supervision may include medications such as cefuroxime axetil tablets, enteric-coated erythromycin tablets, or prednisolone tablets.

5. Meningitis

Infections caused by bacteria, viruses, or other microorganisms may lead to meningitis. These pathogens release toxins and inflammatory mediators that irritate the meninges and nervous tissue, resulting in high fever and headache. Symptoms may include nausea, vomiting, confusion, and seizures. Medications such as ganciclovir dispersible tablets, dexamethasone acetate tablets, or mannitol injection may be administered as prescribed.

In daily life, it is important to strengthen physical exercise, improve overall health, reduce stress, and maintain regular sleep patterns.