There are many causes of pain in the left hand, which may be physiological or a pathological manifestation of trauma, arthropathy, infection, cervical spondylosis and other diseases. The cause should be identified in a timely manner. 1. Physiological factors: long-term physical labor or recent excessive force in the hand, overly strenuous activities, may make the ligaments, muscles, tendons strained or excessive contraction, resulting in pain in the left hand, this is a physiological phenomenon, attention to rest can be relieved. 2. Trauma: If the left limb has been hit by external force recently, it may lead to ligament, muscle and nerve injury or fracture of the left upper limb, and aseptic inflammatory reaction may occur, resulting in pain in the left hand. 3. Joint disease: arthritis is an inflammatory lesion caused by infection, heredity, immunocompromise, degeneration and other factors, such as osteoarthritis, joint effusion, interphalangeal rheumatoid arthritis. Under the stimulation of inflammation, it may lead to the symptoms of left hand pain. 4. Cervical spondylosis: Cervical spondylosis is caused by degenerative changes in the cervical vertebrae, which can cause compression of the surrounding tissues, and when the nerve root is compressed, it may lead to radiating pain and numbness in the hand. Tenosynovitis and soft tissue infections can also cause pain in the left hand. When symptoms of pain in the left hand appear, you should consult a doctor in time and take appropriate treatment under the guidance of the doctor.