Doctor, what is the reason why my fingers are purple?

Insufficient blood supply will make fingernails purple.

If the blood supply of human body is insufficient, it will cause local hypoxia of fingers, and the color of nails will gradually deepen and turn purple-black. Basically, all fingers will have such symptoms.

Anemia can lead to purple nails.

People with weak blood gas will lead to purple fingernails, and most people with anemia will change their fingernails, and their condition will be different with different colors.

The weather is too cold, wear less, blood vessels contract, and peripheral circulation is not good. At this time, your fingernails will turn purple. This will disappear as long as it is heated.