The base of my nails are pink, then fade to pale. at the top, they abruptly turn pink again. it doesn't look like terry's nails to me, and it is worse when i flex them. they feel stiff and cold. cardio said circulation is normal. nerve damage?

Your nails are normal. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV and Covid vaccines. Wish you good health! Safe sex: https://www.hopkinsmedicine.org/health/wellness-and-prevention/safer-sex-guidelines