Anxiety disorder
Certain foods, including citric acid, coffee, chocolate, peanut butter and spices
Certain odors
Emotional stress
Family history
Heat
Spinal cord injury
Adrenal gland disorders
Autonomic dysfunction
Cancer of the lymphatic system
Diabetes
Gout
Heart disease
Heat, humidity, exercise
HIV
Hodgkin disease
Hyperthyroidism
Hypoglycemia
Lung disease
Menopause
Parkinson’s disease
Pheochromocytoma
Pituitary disease
Severe psychological stress
Certain medications
Spinal cord injuries
Stroke
Tuberculosis
Dermatologist
General Physician