There are many reasons that can clinically induce purple fingers, with common ones including heart diseases, pulmonary obstruction, or narrowing of blood vessels in the arms. When purple fingers appear, it is important to go to the hospital for relevant examination and treatment based on one's symptoms to prevent the condition from deteriorating and posing a serious threat to one's health. Here are some potential causes:

1. Heart Factors

Heart factors such as congenital heart disease, heart failure, and incomplete closure of the aortic valve can lead to insufficient blood supply, causing oxygen deficiency and purple fingers. Accurate diagnosis requires a combination of symptoms, signs, and auxiliary examinations. Common symptoms include palpitations, precordial pain, and chest tightness.

2. Lung Factors

Lung factors such as chronic obstructive pulmonary disease, cor pulmonale, and respiratory failure can lead to cyanosis of the fingers due to impaired oxygen and carbon dioxide exchange in the lungs.

3. Vascular Factors

Vascular factors such as Raynaud's disease and narrowing of blood vessels in the arms can also lead to purple fingers.

4. Hormonal Changes Due to Menstruation and Childbirth

Among people with purple hands and feet, women account for the majority. Hormonal changes during menstruation and childbirth can affect the nervous system, leading to vasoconstriction and reduced blood flow, thereby causing purple feet.

5. Mental Stress and Sensitivity

People who experience excessive mental stress, are overly sensitive, constantly worry, and often feel uneasy are also prone to purple fingers.