Red/ purple lines or clubbing
Heart disease could be the culprit.
“Typically, red or purple lines under your nails are from an injury. But if you spot them and don’t remember hurting your nail, it’s smart to make a doctor’s appointment as it could be a sign of heart disease.”
“Clubbing, where the nail curves over the fingertip or toe tip, giving a bulbous look, can also hint at heart disease, a leading killer globally.”
White nails
If you see ghostly white nails, get checked for liver disease.
“Terry’s nails, named after the doctor who found the symptom, is when more than two-thirds of the nail bed turns white, with a red or pink tip. It’s a classic sign of liver disease. Other symptoms include fatigue, yellowing of the skin, and loss of appetite.”