The forehead alternates between feeling hot and cold, but there is no fever.

The forehead generally refers to the front part of the head, and fever means elevated body temperature. In normal circumstances, if the forehead alternates between feeling hot and cold without an actual fever, it may be related to factors such as cold weather, endocrine disorders, allergic dermatitis, upper respiratory tract infections, pneumonia, etc. Patients should promptly visit a正规 hospital to determine the underlying cause and receive targeted treatment. Specific analyses are as follows:

1. Cold Weather

Cold weather may cause blood vessels to constrict, reducing blood flow—especially in superficial areas like the forehead. This can lead to a sensation of coolness, resulting in the aforementioned symptoms. It is recommended that patients apply local heat therapy to relieve discomfort and ensure adequate warmth.

2. Endocrine Disorders

If a patient frequently stays up late or has poor dietary habits, it may disrupt hormonal balance, leading to endocrine disorders. Imbalances in the endocrine system can impair normal body temperature regulation, causing the described fluctuations, and may also be accompanied by symptoms such as obesity and irritability. Patients should adjust their daily routines, maintain sufficient sleep, and avoid staying up late.

3. Allergic Dermatitis

Patients with an allergy-prone constitution may develop allergic dermatitis upon exposure to allergens such as pollen or dust mites. This condition may cause unstable skin temperature on the forehead. Some patients may also experience localized redness, swelling, heat, and itching. Treatment may include medications such as loratadine tablets, cetirizine hydrochloride tablets, or calamine lotion, used under medical guidance.

4. Upper Respiratory Tract Infection

Individuals with low immunity may become infected with viruses, leading to upper respiratory tract infections. Such infections can affect the body's temperature regulation center, resulting in fluctuating sensations of heat and cold on the forehead, along with symptoms like fatigue, nasal congestion, and runny nose. Patients may take medications such as acetaminophen tablets, oseltamivir phosphate granules, or isatis root granules as directed by a physician. Adequate rest and avoidance of overexertion are also important.

5. Pneumonia

Long-term exposure to polluted environments may lead to lung infections and pneumonia. During the early stages of inflammation, patients may experience alternating hot and cold sensations on the forehead. Other symptoms may include chest tightness, coughing, and sputum production. Patients may take antibiotics such as amoxicillin capsules, azithromycin capsules, or moxifloxacin hydrochloride tablets as prescribed to improve their condition.

During treatment, patients should follow a light, easily digestible, and nutritionally balanced diet. Spicy, raw, cold, greasy, and other irritating foods should be avoided to prevent worsening of symptoms.