Hello Mr Sachin,
It sounds like you might be experiencing neck and shoulder pain that radiates to your left hand. This could be due to various reasons, such as muscle strain, nerve compression, or even a potential underlying issue like cervical spondylosis. It's essential to consult with a healthcare professional for a proper diagnosis and treatment plan. In the meantime, you can try gentle neck stretches, applying heat or cold packs, and practising good posture. Avoid activities that worsen the pain; if it persists or worsens, seek medical attention promptly.