A red nose may indicate the presence of rosacea, carcinoid syndrome, meningitis or sepsis, states Healthgrades. Systemic lupus erythematosus, sarcoidosis, encephalitis, appendicitis, pyelonephritis, cholecystitis and pneumonia are other causes of a red nose. Red noses often accompany the flu or common cold and eating spicy foods sometimes causes them.
Some people may experience redness in areas of their face, including their nose, when they feel emotions such as embarrassment, extreme anger or excitement, explains Healthgrades. Red noses are also characteristic of alcohol use, menopausal hot flashes, sunburn and acne. Some medications and supplementation with niacin may cause a reaction in people that results in a red nose.
A patient should visit a doctor to discuss all relevant symptoms associated with his red nose and diagnose the cause of his condition, notes Healthgrades. The doctor is likely to ask about the patient's full medical history and inquire about the nature of his nose redness, such as when it first appeared, how long it lasts, if there is any pain involved, if the redness manifests elsewhere on the body and which supplements he is currently taking.
Symptoms that may accompany a red nose include sneezing, fever, enlarged lymph nodes, runny nose, lethargy, sore throat, muscle aches, nasal congestion and headache, according to Healthgrades. If a person experiences difficulty breathing, behavioral changes, abdominal pain or vomiting, it is important to seek medical attention immediately.