I know from my Daughter who is dieing of lung and brain tumors that fingernail clubbing is a symptom. Now I have a 65 yr old female neighbor who has suddenly lost about 70 lbs .She was a heavy drinker.I just noticed her nails are clubbing.Could it be?
Clubbing is due to multiple causes and cancer is one of them. But not all cancers cause clubbing, it is most common in lung cancer. You have keen observation. Since your neighbor has sudden weight loss with a background history of heavy Chat Doctor.  Alcohol can cause multiple cancers. Apart from liver cancer, it can cause cancers in oral cavity, entire GI tract and also lung