What can cause your lips to turn purple?

* Hypothermia. This occurs when the body loses heat faster than it can produce it, causing the body temperature to drop. Purple lips can be a sign of severe hypothermia and should be treated as a medical emergency.

* Raynaud's disease. This is a condition in which the blood vessels in the fingers and toes become narrow, restricting blood flow. Raynaud's disease can cause the lips to turn purple, especially when the person is exposed to cold temperatures or stress.

* Acrocyanosis. This is a condition in which the hands and feet become cold and blue. Acrocyanosis can be caused by exposure to cold temperatures, certain medications, or underlying medical conditions.

* Frostbite. This occurs when the skin and underlying tissues freeze. Frostbite can cause the lips to turn purple, as well as other symptoms such as numbness, pain, and swelling.

* Certain medications. Some medications, such as nitroglycerin and sildenafil (Viagra), can cause the lips to turn purple.

* Heart problems. In some cases, purple lips can be a sign of a heart problem, such as a heart attack or congestive heart failure.

* Lung problems. Purple lips can also be a sign of a lung problem, such as pneumonia or asthma.

* Other medical conditions. Certain medical conditions, such as anemia, diabetes, and lupus, can also cause the lips to turn purple.

If you experience purple lips, it is important to see a doctor to determine the cause and receive appropriate treatment.