Benign Cutaneous Flush: This is the most common cause of facial flushing, often triggered by emotional responses, spicy food, alcohol, or temperature changes. It's usually harmless and resolves on its own.

Menopause: Hormonal changes during menopause can lead to hot flashes, which often manifest as facial flushing.
Anxiety or Panic Attacks: Stress and anxiety can cause blood vessels to dilate, leading to flushing of the face.
Carcinoid Syndrome: Although less common, this condition, often associated with neuroendocrine tumors, can cause flushing due to the release of serotonin and other substances.
Medication Side Effects: Certain medications, such as niacin, tamoxifen, and some antidepressants, can cause facial flushing as a side effect.

Pheochromocytoma: A rare tumor of the adrenal gland that can cause episodic flushing, hypertension, and other symptoms. Missing this diagnosis could be life-threatening due to the risk of hypertensive crises.
Thyroid Storm: A life-threatening complication of untreated or undertreated hyperthyroidism, which can present with flushing, among other symptoms.
Mastocytosis: A condition characterized by the accumulation of mast cells in the skin and other organs, which can cause flushing, especially after certain triggers.

Erythromelalgia: A disorder that causes burning pain, heat, and redness in the hands and feet, and sometimes the face.
Harlequin Syndrome: A rare condition characterized by asymmetric flushing and sweating of the face, often triggered by emotional stress or exercise.
Autonomic Dysfunction: Certain conditions affecting the autonomic nervous system, such as multiple system atrophy, can lead to abnormal blood vessel regulation and facial flushing.