Nerves also may be damaged during strenuous activities, in an accident, by prolonged exposure to cold or heat, or by radiation given to treat cancer. If your finger continues to bother you, you might see a physician for treatment and evaluation. It may disappear on its own. I cannot find any information about what causes this. The doctor says it's treated with steroids and if she doesn't get treatment quickly she could go blind.
Temporal arteritis is a chronic inflammatory disease of the large arteries.
This disease affects about 1 out of 1,000 people age 50 and older. It is slightly more common in women. The cause is unknown. Symptoms vary depending on which arteries are affected. Typically the large arteries to the head are affected, and a severe headache usually develops suddenly at the temples or back of the head.