Acne Rosacea is a disorder where the blood vessels become damaged when repeatedly dilated by stimuli.
A survey by the National Rosacea Society of 1,066 Rosacea patients showed which factors affect most of the people and can be possible causes of Rosacea.
| Factors | Percent Affected |
| Sun exposure | 81% |
| Emotional stress | 79% |
| Hot weather | 75% |
| Wind | 57% |
| Heavy exercise | 56% |
| Alcohol consumption | 52% |
| Hot baths | 51% |
| Cold weather | 46% |
| Spicy foods | 45% |
| Humidity | 44% |
| Indoor heat | 41% |
| Certain skin-care products | 41% |
| Heated beverages | 36% |
| Certain cosmetics | 27% |
| Medications | 15% |
| Medical conditions | 15% |
| Certain fruits | 13% |
| Marinated meats | 10% |
| Certain vegetables | 9% |
| Dairy products | 8% |
This may also explain the improvement in symptoms experienced by some patients when given a reduced carbohydrate diet. Such a diet would restrict the growth of microorganisms thought to be causes of Rosacea.
