The cramps tend to occur even at minimal exertions, say if I get to hammer a few nails, then around the third or the fourth I start developping cramps in my fingers. However if I let go immediately the cramps too subside symultaneously. Also if I grip onto any object with force and hold the grip for a couple of minutes, I start developing cramps in my fingures / wrist.
Cramps also occur in the fourth finger of my left foot if is exposed to cold (say 15 degrees or so). However covering the foot in a warm blanket gives immediate relief.
Please advise, the causes that could be and investigations required if any.