Cramps in the left little finger can be caused by overwork, calcium deficiency, cervical spondylosis and other factors. 1. Overwork: If the left little finger is overworked, such as lifting heavy objects, operating a computer or a musical instrument, it is easy to produce cramp symptoms, and the muscle will be cramped and tense in a short period of time, accompanied by muscle weakness. 2. Calcium deficiency: As human muscle contraction and cell division require a large amount of calcium, when calcium intake is insufficient, it can stimulate the increase of neuromuscular excitability of the little finger, thus causing muscle spasms in the area and showing the symptoms of cramps in the little finger of the left hand. 3. Cervical spondylosis: due to the patient’s own symptoms of cervical nerve root compression, neck activities can stimulate the cervical nerve root by pulling, resulting in the cervical spinal cord from the brachial plexus nerve innervation of the hand sensory disorders and pain, when the pain is severe, it can be radiated to the pinky finger, including muscle spasms in other fingers. There may be other causes of cramps in the left little finger, so you should consult your doctor to clarify the specific cause and get appropriate treatment if necessary.