Pure autonomic failure (PAF) is a form of dysautonomia that first occurs in middle age or later in life; diagnosed more often in men than in women.
A degenerative disease of the autonomic nervous system, symptoms include dizziness and fainting (caused by orthostatic hypotension), visual disturbances and neck pain. Chest pain, fatigue and sexual dysfunction are less common symptoms that may also occur. Symptoms are worse when standing; sometimes one may relieve symptoms by lying down.
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